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
691 results · Feed
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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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High 8.1
Reflected XSS the login page through the 'username' parameter
ChurchCRM is an open-source church management system. Prior to 7.1.0, there is a Reflected Cross-Site Scripting (XSS) vulnerability on the login page, which is caused by the lack of sanitization or encoding of the username parameter received from the URL. The…
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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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Low 3.1
HTML injection in the web dashboard
An attacker might be able to inject HTML content into the internal web dashboard by sending crafted DNS queries to a DNSdist instance where domain-based dynamic rules have been enabled via either DynBlockRulesGroup:setSuffixMatchRule or DynBlockRulesGroup:set…
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High 7.2
Query Monitor <= 3.20.3 - Reflected Cross-Site Scripting via Request URI
The Query Monitor – The developer tools panel for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘$_SERVER['REQUEST_URI']’ parameter in all versions up to, and including, 3.20.3 due to insufficient input sanitization an…
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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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High 7.3
Home Assistant has stored XSS in Map-card through malicious device name
Home Assistant is open source home automation software that puts local control and privacy first. Starting in version 2020.02 and prior to version 2026.01, an authenticated party can add a malicious name to their device entity, allowing for Cross-Site Scripti…
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Critical 9.4
OpenBao has Reflected XSS in its OIDC authentication error message
OpenBao is an open source identity-based secrets management system. Prior to version 2.5.2, OpenBao installations that have an OIDC/JWT authentication method enabled and a role with `callback_mode=direct` configured are vulnerable to XSS via the `error_descri…
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High 7.7
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in GitLab
GitLab has remediated an issue in GitLab EE affecting all versions from 15.4 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to add email addresses to targeted user accounts due to improper sanitizatio…
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High 7.3
Filament: Unvalidated Range and Values summarizer values can be used for XSS
Filament is a collection of full-stack components for accelerated Laravel development. Versions 4.0.0 through 4.8.4 and 5.0.0 through 5.3.4 have two Filament Table summarizers (Range, Values) that render raw database values without escaping HTML. If there is …
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Critical 9.1
Anchorr Privilege Escalation: Jellyseerr User → Anchorr Admin via Stored XSS
Anchorr is a Discord bot for requesting movies and TV shows and receiving notifications when items are added to a media server. Versions 1.4.1 and below contain a stored XSS vulnerability in the Jellyseerr user selector. Jellyseerr allows any account holder t…
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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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High 8.5
FreeScout: Stored XSS through SVG file upload with filter bypass
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. In versions 1.8.208 and below, bypasses of the attachment view logic and SVG sanitizer make it possible to upload and render an SVG that runs malicious JavaScript. An extension…
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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…
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None 0.0
XSS in @leanprover/unicode-input-component
Lean 4 VS Code Extension is a Visual Studio Code extension for the Lean 4 proof assistant. Projects that use @leanprover/unicode-input-component are vulnerable to an XSS exploit in 0.1.9 of the package and lower. The component re-inserted text in the input el…
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Medium 6.4
Chamilo: Stored Cross-Site Scripting (XSS) in Chamilo LMS Exercise Feedback
Chamilo is a learning management system. Prior to version 1.11.34, a stored XSS vulnerability exists in Chamilo LMS that allows a staff account to execute arbitrary JavaScript in the browser of higher-privileged admin users. The issue arises because feedback …
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Medium 6.1
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software VPN Web Services Cross-Site Scripting Vulnerability
A vulnerability in the VPN web services component of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XS…
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Medium 6.9
Chamilo: HTML injection via open parameter
Chamilo is a learning management system. Prior to version 1.11.30, the open parameter of help.php fails to properly sanitize user input. This allows an attacker to inject arbitrary HTML, such as underlined text, via a crafted URL. This issue has been patched …
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Medium 5.1
Chamilo: Reflected XSS via page parameter
Chamilo is a learning management system. Prior to version 1.11.30, there is a reflected cross-site scripting (XSS) vulnerability due to insufficient sanitization of the page parameter in the session/add_users_to_session.php endpoint. This issue has been patch…
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Medium 5.3
WordPress WooCommerce Photo Reviews plugin <= 1.4.4 - Content Injection vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in villatheme WooCommerce Photo Reviews woocommerce-photo-reviews allows Code Injection.This issue affects WooCommerce Photo Reviews: from n/a through <= 1.4.4.
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High 8.5
n8n Vulnerable to Stored XSS via Various Nodes
n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with permission to create or modify workflows could inject arbitrary scripts into pages rendered by the n8n application using different te…
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Medium 6.1
Vikunja has Reflected HTML Injection via filter Parameter in Projects Module
Vikunja is an open-source self-hosted task management platform. Prior to version 2.0.0, a reflected HTML injection vulnerability exists in the Projects module where the `filter` URL parameter is rendered into the DOM without output encoding when the user clic…
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High 8.7
LinkAce: Stored XSS in Atom Feed via CDATA Escape in List Description
LinkAce is a self-hosted archive to collect website links. Versions 2.4.2 and below have a Stored Cross-site Scripting vulnerability through the Atom feed endpoint for lists (/lists/feed). An authenticated user can inject a CDATA-breaking payload into a list …
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Medium 5.3
WordPress XStore theme <= 9.6.4 - Arbitrary Shortcode Execution vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in 8theme XStore xstore allows Code Injection.This issue affects XStore: from n/a through <= 9.6.4.
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Medium 5.3
WordPress Everest Forms plugin <= 3.4.1 - Arbitrary Shortcode Execution vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in wpeverest Everest Forms everest-forms allows Code Injection.This issue affects Everest Forms: from n/a through <= 3.4.1.
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Medium 5.4
IBM webMethods Integration Server is vulnerable to HTML injection
IBM webMethods Integration Server 12.0 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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High 8.6
Vikunja Affected by XSS Via Task Preview
Vikunja is a todo-app to organize your life. Prior to 1.1.0, TaskGlanceTooltip.vue temporarily creates a div and sets the innerHtml to the description. Since there is no escaping on either the server or client side, a malicious user can share a project, creat…
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Low 3.5
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.6 before 18.6.6, 18.7 before 18.7.4, and 18.8 before 18.8.4 that could have allowed an authenticated user to inject malicious content into project labels titles.
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Medium 6.4
Bold Builder <= 5.5.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via bt_bb_tabs Shortcode
The Bold Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin 'bt_bb_tabs' shortcode in all versions up to, and including, 5.5.1 due to insufficient input sanitization and output escaping on user supplied attributes. T…
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Low 3.5
OpenProject vulnerable to Stored HTML injection
OpenProject is an open-source, web-based project management software. Prior to versions 16.6.7 and 17.0.3, an HTML injection vulnerability occurs in the time tracking function of OpenProject. The application does not escape HTML tags, an attacker with adminis…
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None 0.0
Winter Affected by Stored Cross-Site Scripting (XSS) in Asset Manager
Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Versions of Winter CMS before 1.2.10 allow users with access to the CMS Asset Manager were able to upload SVGs without automatic sanitization. To actively exploi…
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Medium 6.1
Navidrome is vulnerable to XSS via comment from song metadata
Navidrome is an open source web-based music collection server and streamer. Prior to version 0.60.0, a cross-site scripting vulnerability in the frontend allows a malicious attacker to inject code through the comment metadata of a song to exfiltrate user cred…
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High 8.5
n8n is Vulnerable to Stored Cross-Site Scripting via Markdown Rendering in Workflow UI
n8n is an open source workflow automation platform. Prior to versions 1.123.9 and 2.2.1, a Cross-Site Scripting (XSS) vulnerability existed in a markdown rendering component used in n8n's interface, including workflow sticky notes and other areas that support…
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Medium 4.1
ERPNext thru 15.88.1 does not sanitize or remove certain HTML tags specifically `<a>` hyperlinks in fields that are int…
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Medium 5.4
A HTML injection vulnerability exists in the file upload functionality of Cacti <= 1.2.29. When a file with an invalid …
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Medium 6.5CVE-2026-24128 Scanner template
XWiki Affected by Reflected Cross-Site Scripting (XSS) in Error Messages
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Versions 7.0-milestone-2 through 16.10.11, 17.0.0-rc-1 through 17.4.4, and 17.5.0-rc-1 through 17.7.0 contain a reflected Cross-site Scripting (XSS) vulne…
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Medium 4.3
WordPress Textmetrics plugin <= 3.6.5 - Content Injection vulnerability
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Israpil Textmetrics webtexttool allows Code Injection.This issue affects Textmetrics: from n/a through <= 3.6.5.