Weakness (CWE)
CWE-79: Cross-site Scripting
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
How to prevent it (8 mitigations)
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Architecture and Design
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
Examples of libraries and frameworks that make it easier to generate properly encoded output include Microsoft's Anti-XSS library, the OWASP ESAPI Encoding module, and Apache Wicket.
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Implementation, Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages. Study all expected communication protocols and data representations to determine the required encoding strategies.
For any data that will be output to another web page, especially any data that was received from external inputs, use the appropriate encoding on all non-alphanumeric characters.
Parts of the same output document may require different encodings, which will vary depending on whether the output is in the:
- HTML body
- Element attributes (such as src="XYZ")
- URIs
- JavaScript sections
- Cascading Style Sheets and style property
etc. Note that HTML Entity Encoding is only appropriate for the HTML body.
Consult the XSS Prevention Cheat Sheet [REF-724] for more details on the types of encoding and escaping that are needed.
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Architecture and Design, Implementation
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.
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Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
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Architecture and Design
If available, use structured mechanisms that automatically enforce the separation between data and code. These mechanisms may be able to provide the relevant quoting, encoding, and validation automatically, instead of relying on the developer to provide this capability at every point where output is generated.
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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-79
2,688 results · Clear filters · Feed
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Low 3.5
code-projects Online Food Order System edit_food_items.php cross site scripting
A vulnerability was detected in code-projects Online Food Order System 1.0. The affected element is an unknown function of the file edit_food_items.php. Performing a manipulation of the argument dname results in cross site scripting. Remote exploitation of th…
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Low 2.4
SourceCodester Online Book Store System System Settings index.php site_settings cross site scripting
A vulnerability was found in SourceCodester Online Book Store System 1.0. This vulnerability affects unknown code of the file /admin/index.php?page=site_settings of the component System Settings Module. The manipulation results in cross site scripting. The at…
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Low 2.3
Loofah `allowed_uri?` does not detect `javascript:` URIs split by numeric character references without semicolons
Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. From 2.25.0 until 2.25.2, Loofah::HTML5::Scrub.allowed_uri? does not reject javascript: or vbscript: URIs whose scheme is split by semico…
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Low 2.1
Trix: XSS via JSON deserialization bypass in drag-and-drop (Level0InputController)
Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.18, Trix is vulnerable to cross-site scripting when a crafted application/x-trix-document JSON payload is dropped into an editor using the fallback Level0InputControlle…
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Low 2.3
cti-transmute Remote MISP Event Browser Allows Cross-Site Scripting via Malicious Event Metadata
Affected versions of cti-transmute render data obtained from a remote MISP instance into the event-browser interface using HTML interpolation. Because fields such as event IDs, event information, organization names, tags, tag colors, TLP labels, distribution …
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Low 2.0
Discourse: Stored XSS in discourse-local-dates plugin
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, the discourse-local-dates plugin rendered crafted local-date format data as HTML on sites with a modified or disabled default Content Security Policy. This i…
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Low 3.5
SourceCodester Photo Share Website Comment Input Box ajax.php save_upload cross site scripting
A vulnerability was identified in SourceCodester Photo Share Website 1.0. This affects an unknown part of the file /social/ajax.php?action=save_upload of the component Comment Input Box. The manipulation of the argument content leads to cross site scripting. …
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Low 3.5
SourceCodester Photo Share Website index.php home cross site scripting
A flaw has been found in SourceCodester Photo Share Website 1.0. The affected element is an unknown function of the file /social/index.php?page=home. This manipulation of the argument Comment causes cross site scripting. The attack may be initiated remotely. …
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Low 2.4
PHPGurukul Company Visitor Management System manage-newvisitors.php cross site scripting
A security vulnerability has been detected in PHPGurukul Company Visitor Management System 1.0. This issue affects some unknown processing of the file /manage-newvisitors.php. The manipulation of the argument fullname leads to cross site scripting. The attack…
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Low 2.4
DataGear Chart Name HtmlTplDashboardWidgetHtmlRenderer.java HtmlTplDashboardWidgetHtmlRenderer cross site scripting
A vulnerability was determined in DataGear up to 5.0.0. The impacted element is the function HtmlTplDashboardWidgetHtmlRenderer of the file HtmlTplDashboardWidgetHtmlRenderer.java of the component Chart Name Handler. This manipulation of the argument Title ca…
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Low 3.5
GeoDirectory < 2.8.110 - Editor+ Stored XSS via Place Categories
The GeoDirectory WordPress plugin before 2.8.110 does not sanitise and escape a place-category setting before outputting it back in an admin page, allowing high-privilege users such as editors and above to perform Stored Cross-Site Scripting attacks even when…
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Low 3.5
Brizy - Page Builder < 2.8.19 - Author+ Stored XSS via brizy_set_project Global Project Code Asset
The Brizy WordPress plugin before 2.8.19 does not properly restrict who can modify its site-global design data and does not sanitise part of that data before outputting it, allowing authenticated users with Author-level access and above to store arbitrary Jav…
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Low 3.1
OpenAkita File Upload API upload cross site scripting
A security flaw has been discovered in OpenAkita up to 1.27.12. This vulnerability affects unknown code of the file /api/upload of the component File Upload API. The manipulation of the argument File results in cross site scripting. The attack may be performe…
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Low 3.5
ElementsKit Lite < 3.10.01 - Subsite Administrator+ Stored XSS via Megamenu Menu-Item Settings (Multisite)
The ElementsKit Elementor Addons WordPress plugin before 3.10.01 does not sanitize or escape certain megamenu menu-item settings before storing them and outputting them on the front end, and does not require the unfiltered_html capability to save them, allowi…
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Low 3.5
Event Tickets < 5.28.4 - Editor+ Stored XSS via Ticket Move
The Event Tickets and Registration WordPress plugin before 5.28.4 does not properly escape event titles before outputting them in a ticket history log, allowing users with the Editor role and above to perform Stored Cross-Site Scripting attacks that execute a…
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Low 2.1
Astro: Cross-site scripting via unescaped transition:* directive values on hydrated islands
Astro is a web framework for content-driven websites. In versions 3.10.0 through 7.0.3, when a transition:persist, transition:scope, or transition:persist-props directive is applied to a client-hydrated (client:*) component, Astro copied the directive value o…
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Low 2.3
HCL DevOps Plan is susceptible to a Cross-Site Scripting (XSS) vulnerability
HCL DevOps Plan is potentially susceptible to Cross-Site Scripting (XSS) which could allow an attacker to exploit this vulnerability if certain browser weaknesses are present.
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Low 2.4
Pluck CMS Albums albums.admin.php htmlspecialchars_decode cross site scripting
A weakness has been identified in Pluck CMS up to 4.7.21. This vulnerability affects the function htmlspecialchars_decode of the file data/modules/albums/albums.admin.php of the component Albums Module. Executing a manipulation of the argument Info can lead t…
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Low 3.5
SourceCodester Class and Exam Timetabling System forCYS.php cross site scripting
A vulnerability was identified in SourceCodester Class and Exam Timetabling System 1.0. Affected by this issue is some unknown functionality of the file /forCYS.php. Such manipulation of the argument course leads to cross site scripting. The attack may be per…
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Low 3.5
SourceCodester Class and Exam Timetabling System CYS.php cross site scripting
A vulnerability was determined in SourceCodester Class and Exam Timetabling System 1.0. Affected by this vulnerability is an unknown functionality of the file /CYS.php. This manipulation of the argument course causes cross site scripting. The attack is possib…
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Low 3.5
SourceCodester Class and Exam Timetabling System forexam.php cross site scripting
A security flaw has been discovered in SourceCodester Class and Exam Timetabling System 1.0. This affects an unknown part of the file /forexam.php. The manipulation of the argument day results in cross site scripting. It is possible to launch the attack remot…
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Low 3.5
SourceCodester Class and Exam Timetabling System schoolyr.php cross site scripting
A vulnerability was identified in SourceCodester Class and Exam Timetabling System 1.0. Affected by this issue is some unknown functionality of the file /schoolyr.php. The manipulation of the argument sy leads to cross site scripting. It is possible to initia…
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Low 3.5
AstrBotDevs AstrBot T2I Feature base.py NetworkRenderStrategy.render cross site scripting
A security vulnerability has been detected in AstrBotDevs AstrBot up to 4.25.2. Affected by this issue is the function Star.text_to_image/NetworkRenderStrategy.render of the file astrbot/core/star/base.py of the component T2I Feature. The manipulation leads t…
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Low 2.3
Symfony UX: XSS in symfony/ux-live-component via attacker-controlled child component tag
Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, Symfony\UX\LiveComponent\Util\ChildComponentPartialRenderer::createHtml() interpolates the client-controlled children[id].tag value from LiveComponentSubscriber and Intercept…
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Low 3.6
jadx: HTML Injection in Summary panel
jadx is a Dex to Java decompiler. Prior to 1.5.6, jadx-gui is affected by an HTML injection vulnerability in the Summary tab because SummaryNode.java appends arches and perArchCount values derived from .so file path components inside an APK into an HTML panel…
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Low 2.1
Symfony: HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — javascript: URI Survives Sanitization (XSS)
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlAttributeSanitizer::getSupportedAttributes() omits URL-valued attributes including action, formaction, post…
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Low 2.0
Symfony: Stored XSS in WebProfiler CodeExtension::fileExcerpt() — Unescaped Non-PHP File Rendering
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.4.24 until 6.4.40, 7.4.12, and 8.0.12, the development profiler file_excerpt Twig filter escapes PHP files through highlight_string() but interpolates lin…
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Low 3.5
FacturaScripts: Stored XSS in WidgetVariante and WidgetSubcuenta modal lists via HTML-attribute decoding of `Tools::noHtml`-escaped quotes inside `onclick=`
## Summary `WidgetVariante::renderVariantList` (`Core/Lib/Widget/WidgetVariante.php:298-330`) and `WidgetSubcuenta::renderSubaccountList` (`Core/Lib/Widget/WidgetSubcuenta.php:290-321`) build the `<tr onclick="...">` row for each modal hit by concatenating th…
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Low 2.6
Easy!Appointments disable_booking_message rendered as raw HTML on public booking page — Stored XSS
Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 allow administrators to define a custom "booking disabled" message through the booking settings page. That value is stored in the `disable_booking_message` setting via a rich-te…
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Low 3.5
code-projects Online Job Portal DetailJob.php cross site scripting
A security vulnerability has been detected in code-projects Online Job Portal 1.0. This impacts an unknown function of the file /Admin/DetailJob.php. The manipulation leads to cross site scripting. The attack is possible to be carried out remotely. The exploi…
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Low 2.4
SourceCodester Online Book Store System User Management cross site scripting
A vulnerability was identified in SourceCodester Online Book Store System 1.0. This issue affects some unknown processing of the component User Management Module. Such manipulation of the argument Name/Username leads to cross site scripting. The attack can be…
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Low 3.5
vnotex vnote YAML Frontmatter markdownit.js cross site scripting
A weakness has been identified in vnotex vnote up to 3.20.1. Impacted is an unknown function of the file /src/data/extra/web/js/markdownit.js of the component YAML Frontmatter. This manipulation of the argument p_metaData causes cross site scripting. The atta…
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Low 3.5
Akpali9 Attendance-Management-System absent.php cross site scripting
A vulnerability was detected in Akpali9 Attendance-Management-System up to 70b91fe38f4195b701a45f0edcd4f42d5f64aeee. This issue affects some unknown processing of the file absent.php. Performing a manipulation of the argument export_date results in cross site…
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Low 3.5
In JetBrains YouTrack before 2026.2.17394 stored XSS via article titles in digest emails was possible
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Low 2.4
MyEMS Admin Backend svg.py on_post cross site scripting
A vulnerability was found in MyEMS up to 6.4.0. The affected element is the function on_post of the file myems-api/core/svg.py of the component Admin Backend. The manipulation of the argument new_values['data'] results in cross site scripting. The attack can …
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Low 3.5
NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting
A vulnerability was identified in NousResearch hermes-agent up to 2026.5.29.2. Affected by this issue is the function MatrixAdapter._markdown_to_html of the file gateway/platforms/matrix.py of the component Matrix Adapter. Such manipulation leads to cross sit…
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Low 0.4
PAN-OS: Multiple Cross-Site Scripting (XSS) Vulnerabilities
Multiple cross site scripting vulnerabilities in the User-ID™ Authentication Portal (aka Captive Portal) service, GlobalProtect™ gateway/portal features and Clientless VPN of Palo Alto Networks PAN-OS® software enables a malicious unauthenticated user to stor…
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Low 3.9CVE-2026-55592 Scanner template
Dashy: XSS in workspace url parameter
Dashy is a self-hostable personal dashboard. Prior to 4.3.7, Dashy's workspace view trusts the url query parameter and assigns it directly to an iframe source without scheme validation. If a logged-in user opens a crafted workspace link containing a javascrip…
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Low 3.5
crater-invoice-inc crater Invoice Note InvoicesRequest.php getFormattedString cross site scripting
A weakness has been identified in crater-invoice-inc crater up to 6.0.6. This affects the function getFormattedString of the file app/Http/Requests/InvoicesRequest.php of the component Invoice Note Handler. Executing a manipulation of the argument notes can l…
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Low 3.5
mjperpinosa stumasy add_into_dictionary.php add_definition cross site scripting
A security vulnerability has been detected in mjperpinosa stumasy up to 327d1b0f2915ba79d7ef8ebb74553e987609d9be. This affects the function add_definition of the file application/PHP/objects/notes/add_into_dictionary.php. Such manipulation of the argument ref…