Weakness (CWE)
CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page
The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.
How to prevent it (4 mitigations)
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Implementation
Carefully check each input parameter against a rigorous positive specification (allowlist) defining the specific characters and format allowed. All input should be neutralized, not just parameters that the user is supposed to specify, but all data in the request, including hidden fields, cookies, headers, the URL itself, and so forth. A common mistake that leads to continuing XSS vulnerabilities is to validate only fields that are expected to be redisplayed by the site. We often encounter data from the request that is reflected by the application server or the application that the development team did not anticipate. Also, a field that is not currently reflected may be used by a future developer. Therefore, validating ALL parts of the HTTP request is recommended.
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Implementation
Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.
The problem of inconsistent output encodings often arises in web pages. If an encoding is not specified in an HTTP header, web browsers often guess about which encoding is being used. This can open up the browser to subtle XSS attacks.
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Implementation
With Struts, write all data from form beans with the bean's filter attribute set to true.
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Implementation
To help mitigate XSS attacks against the user's session cookie, set the session cookie to be HttpOnly. In browsers that support the HttpOnly feature (such as more recent versions of Internet Explorer and Firefox), this attribute can prevent the user's session cookie from being accessible to malicious client-side scripts that use document.cookie. This is not a complete solution, since HttpOnly is not supported by all browsers. More importantly, XmlHttpRequest and other powerful browser technologies provide read access to HTTP headers, including the Set-Cookie header in which the HttpOnly flag is set.
Source: MITRE CWE-80
426 results · Clear filters · Feed
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Medium 5.3
Stored XSS in ticket confirmation page
Malicious HTML content could be injected into the email address of an order, which pretix showed without sanitization on the confirmation page for individual tickets in that order.
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Medium 5.4
Gogs: Unauthenticated Jupyter Notebook (ipynb) Sanitizer allows arbitrary data: URIs leading to XSS
Gogs is an open source self-hosted Git service. Prior to 0.14.3, the Jupyter Notebook (ipynb) sanitizer endpoint at POST /-/api/sanitize_ipynb allows arbitrary data: URIs without proper restrictions, potentially leading to Cross-Site Scripting (XSS). The endp…
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Medium 5.4
Apache Atlas: Stored XSS in Create Entity page
An authenticated user can perform XSS. This issue affects Apache Atlas versions 2.4.0 and earlier. Users are recommended to upgrade to version 2.5.0, which fixes the issue.
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Medium 6.1
Flowise - Cross-Site Scripting in Chat Messages and Agent Workflows
Flowise before 3.0.8 contains a cross-site scripting (XSS) vulnerability caused by insufficient input filtering in chat messages and custom agent functions. An attacker can inject malicious JavaScript by sending an iframe payload (e.g., <iframe src="javascrip…
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Medium 5.4
Apache Answer: HTML Content Injection in Email
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.0. User-supplied content was included in notification emails without proper escaping, allowing authenti…
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Medium 6.1
ScadaBR Unauthenticated Reflected Cross-Site Scripting
A reflected cross-site scripting issue exists in URL handling.
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Medium 5.6
RabbitMQ: Unsanitized vhost names allow for XSS in management UI
RabbitMQ is a messaging and streaming broker. From 3.7.0 to before 4.1.2 and 4.0.13, This vulnerability is fixed in 4.1.2 and 4.0.13.
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Medium 5.3
WordPress Nyla theme <= 1.7 - Arbitrary Shortcode Execution vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in SpabRice Nyla allows Code Injection. This issue affects Nyla: from n/a through 1.7.
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Medium 4.8
CtrlPanel: Stored XSS in Admin Role Management via Unescaped DataTable HTML Output
CtrlPanel is open-source billing software for hosting providers. Versions 1.1.1 and prior contain a Stored Cross-Site Scripting (XSS) vulnerability exists in the admin role management interface. In app/Http/Controllers/Admin/RoleController.php, the datatable(…
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Medium 5.1
Open WebUI: Stored Cross-Site Scripting in SVG Renderer
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.6.31, there is a Cross-Site Scripting vulnerability in Open WebUI SVG renderer implementation. This vulnerability is fixed in 0.6.31.
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Medium 6.1
MapGeo - Interactive Geo Maps <= 1.6.27 - Reflected Cross-Site Scripting via 'map' Parameter
The MapGeo – Interactive Geo Maps plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'map' parameter in the display-map shortcode in all versions up to, and including, 1.6.27 due to insufficient input sanitization and output escaping…
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Medium 4.6
efw4.X: Stored XSS via previewServlet
efw4.X is an Enterprise Framework for Web. Prior to 4.08.010, the previewServlet serves files with their detected MIME type based on file extension, without any content sanitization or security headers. Files with .html, .htm, or .svg extensions are served as…
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Medium 5.4
WordPress GetPaid Plugin 2.4.6 HTML Injection via Help Text
WordPress GetPaid Plugin 2.4.6 contains an HTML injection vulnerability that allows authenticated attackers to inject arbitrary HTML code by exploiting the Help Text field in payment forms. Attackers can inject malicious HTML including image tags and scripts …
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Medium 6.3
Grimmory: Stored XSS via Malicious EPUB Enables Session Token Theft
Grimmory is a self-hosted digital library. Prior to version 2.3.1, a stored cross-site scripting (XSS) vulnerability in Grimmory's browser-based EPUB reader allows an attacker to embed arbitrary JavaScript in a crafted EPUB file. When a victim opens the book,…
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Medium 6.1
MapServer: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in OpenLayers viewer
MapServer is a system for developing web-based GIS applications. From version 6.0 to before version 8.6.2, a reflected XSS vulnerability in MapServer's WMS server allows an unauthenticated attacker to inject arbitrary HTML/JavaScript into the browser of any u…
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Medium 6.1CVE-2026-41575 Public exploit
th30d4y/IP: DOM-Based Cross-Site Scripting (XSS) Vulnerability
In th30d4y/IP from version 1.0.1 to before version 2.0.1, a DOM-Based Cross-Site Scripting (XSS) vulnerability was identified in an IP Reputation Checker application. Unsanitized user input was directly rendered in the browser, allowing attackers to execute a…
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Medium 4.3
Weblate is vulnerable to XSS via crafted Markdown
Weblate is a web based localization tool. Prior to version 5.17.1, the Markdown renderer used in user comments and other user-provided content didn't properly sanitize some attributes. This issue has been patched in version 5.17.1.
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Medium 4.8
PhpSpreadsheet XSS via number format text substitution in HTML Writer
PhpSpreadsheet is a library for reading and writing spreadsheet files. In versions 1.30.3 and earlier, 2.0.0 through 2.1.15, 2.2.0 through 2.4.4, 3.3.0 through 3.10.4, and 4.0.0 through 5.6.0, the HTML Writer skips htmlspecialchars() output escaping when a ce…
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Medium 5.1
Pega Platform versions 8.1.0 through 25.1.1 are affected by an HTML Injection vulnerability in a user interface component. Requires a high privileged user with a developer role.
Pega Platform versions 8.1.0 through 25.1.1 are affected by an HTML Injection vulnerability in a user interface component. Requires a high privileged user with a developer role.
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Medium 6.1
A vulnerability in the Desktop Agent functionality of Cisco Webex Contact Center could have allowed an unauthenticated,…
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Medium 6.5CVE-2026-40105 Scanner template
XWiki has Reflected Cross-Site Scripting (XSS) in its page history compare functionality
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Versions 10.4-rc-1, through 16.10.15, 17.0.0-rc-1, through 17.4.7 and 17.5.0-rc-1 through 17.10.0 contain a reflected cross-site scripting vulnerability (…
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Medium 5.1
MaxKB: Stored XSS via Unsanitized html_rander Tags in Markdown Rendering
MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a Stored Cross-Site Scripting (XSS) vulnerability that allows authenticated users to inject arbitrary HTML and JavaScript into the Application prologue (Opening Remarks) fie…
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Medium 4.6CVE-2026-33657 Public exploit
EspoCRM: Stored HTML injection in email notifications about stream notes via unescaped post field
EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below have a stored HTML injection vulnerability that allows any authenticated user with standard (non-administrative) privileges to inject arbitrary HTML into system-g…
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Medium 6.1
A HTML Injection vulnerability exists in the Dashboard module of Vtiger CRM 8.4.0. The application fails to properly ne…
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Medium 5.3
ChurchCRM has an XSS vulnerability
ChurchCRM is an open-source church management system. Prior to 7.1.0, an XSS vulnerability allows attacker-supplied input sent via a the EName and EDesc parameters in EditEventAttendees.php to be rendered in a page without proper output encoding, enabling arb…
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Medium 5.3
Zammad improperly neutralizes of script-related HTML tags in ticket articles
Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the HTML sanitizer for ticket articles was missing proper sanitization of data: ... URI schemes, resulting in storing such malicious content in the database of the Z…
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Medium 5.3
WordPress tagDiv Composer plugin <= 5.4.3 - Arbitrary Shortcode Execution vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in tagDiv tagDiv Composer td-composer allows Code Injection.This issue affects tagDiv Composer: from n/a through <= 5.4.3.
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Medium 5.3
WordPress Uminex theme <= 1.0.9 - Arbitrary Shortcode Execution vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in kutethemes Uminex uminex allows Code Injection.This issue affects Uminex: from n/a through <= 1.0.9.
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Medium 5.3
WordPress Armania theme <= 1.4.8 - Arbitrary Shortcode Execution vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in kutethemes Armania armania allows Code Injection.This issue affects Armania: from n/a through <= 1.4.8.
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Medium 5.3
WordPress TechOne theme <= 3.0.3 - Arbitrary Shortcode Execution vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in kutethemes TechOne techone allows Code Injection.This issue affects TechOne: from n/a through <= 3.0.3.
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Medium 5.3
WordPress DukaMarket theme <= 1.3.0 - Arbitrary Shortcode Execution vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in kutethemes DukaMarket dukamarket allows Code Injection.This issue affects DukaMarket: from n/a through <= 1.3.0.
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Medium 6.3
Stored XSS through the dynamic table format in Cargo
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in WikiWorks Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.
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Medium 6.3
Stored XSS through list fields on Cargo's page values and Special:CargoTables
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.
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Medium 6.3
Stored XSS through URLs in Cargo's map format
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.
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Medium 4.3
Papra has an HTML Injection in Transactional Emails via Unescaped User Display Name
Papra is a minimalistic document management and archiving platform. Prior to 26.4.0, transactional email templates in Papra interpolate user.name directly into HTML without escaping or sanitization. An attacker who registers with a display name containing HTM…
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Medium 4.8
Multiple vulnerabilities have been addressed in IBM Aspera Shares
IBM Aspera Shares 1.9.9 through 1.11.0 is vulnerable to HTML injection. A remote attacker could inject malicious HTML code, which when viewed, would be executed in the victim's Web browser within the security context of the hosting site.
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Medium 6.4
Ibtana - WordPress Website Builder <= 1.2.5.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
The Ibtana – WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'ive' shortcode in all versions up to, and including, 1.2.5.7 due to insufficient input sanitization and output escaping on user supplied…
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Medium 5.9
SuiteCRM has blind XSS in return_id parameter
SuiteCRM is an open-source, enterprise-ready Customer Relationship Management (CRM) software application. Prior to versions 7.15.1 and 8.9.3, the value of the return_id request parameter is copied into the value of an HTML tag attribute which is an event hand…
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Medium 4.1
Discourse vulnerable to HTML injection via prohibited iframe URLs
Discourse is an open source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1 and 2026.1.2, insufficient cleanup in the default Codepen allowed iframes value allows an attacker to trick a user into changing the URL of the main page. This issu…
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Medium 6.9
LeafKit's HTML escaping may be skipped for Collection values, enabling XSS
LeafKit is a templating language with Swift-inspired syntax. Prior to version 1.14.2, HTML escaping doesn't work correctly when a template prints a collection (Array / Dictionary) via `#(value)`. This can result in XSS, allowing potentially untrusted input to…