minusworld.omni-xss

python.flask.security.dangerous-template-string.dangerous-template-string

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Found a template created with string formatting. This is susceptible to server-side template injection and cross-site scripting attacks.

python.flask.security.xss.audit.template-unescaped-with-safe.template-unescaped-with-safe

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Detected a segment of a Flask template where autoescaping is explicitly disabled with '| safe' filter. This allows rendering of raw HTML in this segment. Ensure no user data is rendered here, otherwise this is a cross-site scripting (XSS) vulnerability.

python.flask.security.audit.render-template-string.render-template-string

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Found a template created with string formatting. This is susceptible to server-side template injection and cross-site scripting attacks.

python.flask.security.xss.audit.template-autoescape-off.template-autoescape-off

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Detected a segment of a Flask template where autoescaping is explicitly disabled with '{% autoescape off %}'. This allows rendering of raw HTML in this segment. Ensure no user data is rendered here, otherwise this is a cross-site scripting (XSS) vulnerability, or turn autoescape on.

ruby.lang.security.json-entity-escape.json-entity-escape

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Checks if HTML escaping is globally disabled for JSON output. This could lead to XSS.

ruby.rails.security.audit.xss.templates.alias-for-html-safe.alias-for-html-safe

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The syntax `<%== ... %>` is an alias for `html_safe`. This means the content inside these tags will be rendered as raw HTML. This may expose your application to cross-site scripting. If you need raw HTML, prefer using the more explicit `html_safe` and be sure to correctly sanitize variables using a library such as DOMPurify.

python.django.security.audit.avoid-mark-safe.avoid-mark-safe

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'mark_safe()' is used to mark a string as "safe" for HTML output. This disables escaping and could therefore subject the content to XSS attacks. Use 'django.utils.html.format_html()' to build HTML for rendering instead.

python.django.security.audit.xss.context-autoescape-off.context-autoescape-off

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Detected a Context with autoescape disabled. If you are rendering any web pages, this exposes your application to cross-site scripting (XSS) vulnerabilities. Remove 'autoescape: False' or set it to 'True'.

python.django.security.audit.xss.global-autoescape-off.global-autoescape-off

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Autoescape is globally disbaled for this Django application. If you are rendering any web pages, this exposes your application to cross-site scripting (XSS) vulnerabilities. Remove 'autoescape: False' or set it to 'True'.

python.django.security.audit.xss.template-autoescape-off.template-autoescape-off

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Detected a template block where autoescaping is explicitly disabled with '{% autoescape off %}'. This allows rendering of raw HTML in this segment. Turn autoescaping on to prevent cross-site scripting (XSS). If you must do this, consider instead, using `mark_safe` in Python code.

python.django.security.audit.xss.template-var-unescaped-with-safeseq.template-var-unescaped-with-safeseq

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Detected a template variable where autoescaping is explicitly disabled with '| safeseq' filter. This allows rendering of raw HTML in this segment. Ensure no user data is rendered here, otherwise this is a cross-site scripting (XSS) vulnerability. If you must do this, use `mark_safe` in your Python code.

python.flask.security.unescaped-template-extension.unescaped-template-extension

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Flask does not automatically escape Jinja templates unless they have .html, .htm, .xml, or .xhtml extensions. This could lead to XSS attacks. Use .html, .htm, .xml, or .xhtml for your template extensions. See https://flask.palletsprojects.com/en/1.1.x/templating/#jinja-setup for more information.

python.flask.security.unsanitized-input.response-contains-unsanitized-input

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Flask response reflects unsanitized user input. This could lead to a cross-site scripting vulnerability (https://owasp.org/www-community/attacks/xss/) in which an attacker causes arbitrary code to be executed in the user's browser. To prevent, please sanitize the user input, e.g. by rendering the response in a Jinja2 template (see considerations in https://flask.palletsprojects.com/en/1.0.x/security/).

javascript.express.security.audit.xss.mustache.var-in-script-tag.var-in-script-tag

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Detected a template variable used in a script tag. Although template variables are HTML escaped, HTML escaping does not always prevent cross-site scripting (XSS) attacks when used directly in JavaScript. If you need this data on the rendered page, consider placing it in the HTML portion (outside of a script tag). Alternatively, use a JavaScript-specific encoder, such as the one available in OWASP ESAPI.

python.flask.security.xss.audit.template-href-var.template-href-var

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Detected a template variable used in an anchor tag with the 'href' attribute. This allows a malicious actor to input the 'javascript:' URI and is subject to cross- site scripting (XSS) attacks. Use 'url_for()' to safely generate a URL. You may also consider setting the Content Security Policy (CSP) header.

python.flask.security.xss.audit.template-unquoted-attribute-var.template-unquoted-attribute-var

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Detected a unquoted template variable as an attribute. If unquoted, a malicious actor could inject custom JavaScript handlers. To fix this, add quotes around the template expression, like this: "{{ $...VAR }}".

go.lang.security.audit.xss.no-interpolation-js-template-string.no-interpolation-js-template-string

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Detected template variable interpolation in a JavaScript template string. This is potentially vulnerable to cross-site scripting (XSS) attacks because a malicious actor has control over JavaScript but without the need to use escaped characters. Instead, obtain this variable outside of the template string and ensure your template is properly escaped.

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Detected Django filters flagged with 'is_safe'. 'is_safe' tells Django not to apply escaping on the value returned by this filter (although the input is escaped). Used improperly, 'is_safe' could expose your application to cross-site scripting (XSS) vulnerabilities. Ensure this filter does not 1) add HTML characters, 2) remove characters, or 3) use external data in any way. Consider instead removing 'is_safe' and explicitly marking safe content with 'mark_safe()'.

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`html_safe()` add the `__html__` magic method to the provided class. The `__html__` method indicates to the Django template engine that the value is 'safe' for rendering. This means that normal HTML escaping will not be applied to the return value. This exposes your application to cross-site scripting (XSS) vulnerabilities. If you need to render raw HTML, consider instead using `mark_safe()` which more clearly marks the intent to render raw HTML than a class with a magic method.

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Detected an explicit unescape in an EJS template, using '<%- ... %>' If external data can reach these locations, your application is exposed to a cross-site scripting (XSS) vulnerability. Use '<%= ... %>' to escape this data. If you need escaping, ensure no external data can reach this location.

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Detected a template variable used in an anchor tag with the 'href' attribute. This allows a malicious actor to input the 'javascript:' URI and is subject to cross- site scripting (XSS) attacks. If using a relative URL, start with a literal forward slash and concatenate the URL, like this: href='/<%= link %>'. You may also consider setting the Content Security Policy (CSP) header.

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Detected an explicit unescape in a Mustache template, using triple braces '{{{...}}}' or ampersand '&'. If external data can reach these locations, your application is exposed to a cross-site scripting (XSS) vulnerability. If you must do this, ensure no external data can reach this location.

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Detected a unescaped variables using '&attributes'. If external data can reach these locations, your application is exposed to a cross-site scripting (XSS) vulnerability. If you must do this, ensure no external data can reach this location.

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Detected an explicit unescape in a Pug template, using either '!=' or '!{...}'. If external data can reach these locations, your application is exposed to a cross-site scripting (XSS) vulnerability. If you must do this, ensure no external data can reach this location.

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Detected a template variable used in an anchor tag with the 'href' attribute. This allows a malicious actor to input the 'javascript:' URI and is subject to cross- site scripting (XSS) attacks. If using a relative URL, start with a literal forward slash and concatenate the URL, like this: a(href='/'+url). You may also consider setting the Content Security Policy (CSP) header.

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Detected a template variable used in a script tag. Although template variables are HTML escaped, HTML escaping does not always prevent cross-site scripting (XSS) attacks when used directly in JavaScript. If you need this data on the rendered page, consider placing it in the HTML portion (outside of a script tag). Alternatively, use a JavaScript-specific encoder, such as the one available in OWASP ESAPI.

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Detected Flask route directly returning a formatted string. This is subject to cross-site scripting if user input can reach the string. Consider using the template engine instead and rendering pages with 'render_template()'.

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Detected direct use of jinja2. If not done properly, this may bypass HTML escaping which opens up the application to cross-site scripting (XSS) vulnerabilities. Prefer using the Flask method 'render_template()' and templates with a '.html' extension in order to prevent XSS.

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Detected explicitly unescaped content using 'Markup()'. This permits the unescaped data to include unescaped HTML which could result in cross-site scripting. Ensure this data is not externally controlled, or consider rewriting to not use 'Markup()'.

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Found a class extending 'SafeString', 'SafeText' or 'SafeData'. These classes are for bypassing the escaping engine built in to Django and should not be used directly. Improper use of this class exposes your application to cross-site scripting (XSS) vulnerabilities. If you need this functionality, use 'mark_safe' instead and ensure no user data can reach it.

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Detected data rendered directly to the end user via 'HttpResponse' or a similar object. This bypasses Django's built-in cross-site scripting (XSS) defenses and could result in an XSS vulnerability. Use Django's template engine to safely render HTML.

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The `__html__` method indicates to the Django template engine that the value is 'safe' for rendering. This means that normal HTML escaping will not be applied to the return value. This exposes your application to cross-site scripting (XSS) vulnerabilities. If you need to render raw HTML, consider instead using `mark_safe()` which more clearly marks the intent to render raw HTML than a class with a magic method.

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Detected a template variable used in an anchor tag with the 'href' attribute. This allows a malicious actor to input the 'javascript:' URI and is subject to cross- site scripting (XSS) attacks. If using a relative URL, start with a literal forward slash and concatenate the URL, like this: href='/{{link}}'. You may also consider setting the Content Security Policy (CSP) header.

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Detected a template variable used in an anchor tag with the 'href' attribute. This allows a malicious actor to input the 'javascript:' URI and is subject to cross- site scripting (XSS) attacks. Use the 'url' template tag to safely generate a URL. You may also consider setting the Content Security Policy (CSP) header.

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Detected an element with disabled HTML escaping. If external data can reach this, this is a cross-site scripting (XSS) vulnerability. Ensure no external data can reach here, or remove 'escape=false' from this element.

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JSP scriptlet detected. Scriptlets are difficult to use securely and are considered bad practice. See https://stackoverflow.com/a/3180202. Instead, consider migrating to JSF or using the Expression Language '${...}' with the escapeXml function in your JSP files.

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Detected an Expression Language segment that does not escape output. This is dangerous because if any data in this expression can be controlled externally, it is a cross-site scripting vulnerability. Instead, use the 'escapeXml' function from the JSTL taglib. See https://www.tutorialspoint.com/jsp/jstl_function_escapexml.htm for more information.

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Detected a request with potential user-input going into a OutputStream or Writer object. This bypasses any view or template environments, including HTML escaping, which may expose this application to cross-site scripting (XSS) vulnerabilities. Consider using a view technology such as JavaServer Faces (JSFs) which automatically escapes HTML views.

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When working with web applications that involve rendering user-generated content, it's important to properly escape any HTML content to prevent Cross-Site Scripting (XSS) attacks. In Go, the `text/template` package does not automatically escape HTML content, which can leave your application vulnerable to these types of attacks. To mitigate this risk, it's recommended to use the `html/template` package instead, which provides built-in functionality for HTML escaping. By using `html/template` to render your HTML content, you can help to ensure that your web application is more secure and less susceptible to XSS vulnerabilities.

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Detected 'Fprintf' or similar writing to 'http.ResponseWriter'. This bypasses HTML escaping that prevents cross-site scripting vulnerabilities. Instead, use the 'html/template' package to render data to users.

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Detected template variable interpolation in an HTML tag. This is potentially vulnerable to cross-site scripting (XSS) attacks because a malicious actor has control over HTML but without the need to use escaped characters. Use explicit tags instead.

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Detected 'io.WriteString()' writing directly to 'http.ResponseWriter'. This bypasses HTML escaping that prevents cross-site scripting vulnerabilities. Instead, use the 'html/template' package to render data to users.

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Semgrep could not determine that the argument to 'template.HTML()' is a constant. 'template.HTML()' and similar does not escape contents. Be absolutely sure there is no user-controlled data in this template. If user data can reach this template, you may have a XSS vulnerability. Instead, do not use this function and use 'template.Execute()'.

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'content_tag()' bypasses HTML escaping for some portion of the content. If external data can reach here, this exposes your application to cross-site scripting (XSS) attacks. Ensure no external data reaches here. If you must do this, create your HTML manually and use 'html_safe'. Ensure no external data enters the HTML-safe string!

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'html_safe()' does not make the supplied string safe. 'html_safe()' bypasses HTML escaping. If external data can reach here, this exposes your application to cross-site scripting (XSS) attacks. Ensure no external data reaches here.

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'raw()' bypasses HTML escaping. If external data can reach here, this exposes your application to cross-site scripting (XSS) attacks. If you must do this, construct individual strings and mark them as safe for HTML rendering with `html_safe()`.

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'render inline: ...' renders an entire ERB template inline and is dangerous. If external data can reach here, this exposes your application to server-side template injection (SSTI) or cross-site scripting (XSS) attacks. Instead, consider using a partial or another safe rendering method.

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'render text: ...' actually sets the content-type to 'text/html'. If external data can reach here, this exposes your application to cross-site scripting (XSS) attacks. Instead, use 'render plain: ...' to render non-HTML text.

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Detected manual creation of an ERB template. Manual creation of templates may expose your application to server-side template injection (SSTI) or cross-site scripting (XSS) attacks if user input is used to create the template. Instead, create a '.erb' template file and use 'render'.

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Detected a template variable used in 'link_to'. This will generate dynamic data in the 'href' attribute. This allows a malicious actor to input the 'javascript:' URI and is subject to cross- site scripting (XSS) attacks. If using a relative URL, start with a literal forward slash and concatenate the URL, like this: 'link_to "Here", "/"+@link'. You may also consider setting the Content Security Policy (CSP) header.

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Detected a unquoted template variable as an attribute. If unquoted, a malicious actor could inject custom JavaScript handlers. To fix this, add quotes around the template expression, like this: "<%= expr %>".

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Detected a template variable used in an anchor tag with the 'href' attribute. This allows a malicious actor to input the 'javascript:' URI and is subject to cross- site scripting (XSS) attacks. If using a relative URL, start with a literal forward slash and concatenate the URL, like this: href='/<%= link =>'. You may also consider setting the Content Security Policy (CSP) header.

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Detected directly writing or similar in 'http.ResponseWriter.write()'. This bypasses HTML escaping that prevents cross-site scripting vulnerabilities. Instead, use the 'html/template' package and render data using 'template.Execute()'.

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Detected directly writing to a Response object from user-defined input. This bypasses any HTML escaping and may expose your application to a Cross-Site-scripting (XSS) vulnerability. Instead, use 'resp.render()' to render safely escaped HTML.

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The Mustache escape function is being overwritten. This could bypass HTML escaping safety measures built into the rendering engine, exposing your application to cross-site scripting (XSS) vulnerabilities. If you need unescaped HTML, use the triple brace operator in your template: '{{{ ... }}}'.

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'content_tag' exhibits unintuitive escaping behavior and may accidentally expose your application to cross-site scripting. If using Rails 2, only attribute values are escaped. If using Rails 3, content and attribute values are escaped. Tag and attribute names are never escaped. Because of this, it is recommended to use 'html_safe' if you must render raw HTML data.

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'html_safe' renders raw HTML. This means that normal HTML escaping is bypassed. If user data can be controlled here, this exposes your application to cross-site scripting (XSS). If you need to do this, be sure to correctly sanitize the data using a library such as DOMPurify.

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'raw' renders raw HTML, as the name implies. This means that normal HTML escaping is bypassed. If user data can be controlled here, this exposes your application to cross-site scripting (XSS). If you need to do this, be sure to correctly sanitize the data using a library such as DOMPurify.