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
32,779 results · Feed
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Medium 6.0
Part-DB: Stored XSS / HTML injection in activity-log Extra column via unsanitized CollectionElementDeleted element name (sibling-sanitizer gap)
Part-DB is an open source inventory management system for electronic components. Prior to version 2.12.1, LogEntryExtraFormatter builds the HTML shown in the "Extra" column of the activity-log table (/log) and in element history tables. Every branch of LogEnt…
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Medium 4.3
gedelumbung HospitalManagement Admin Routing routing_pages.php simpan cross site scripting
A security flaw has been discovered in gedelumbung HospitalManagement up to c2d45543789a3887067d3915f69d44cfc2cf76a8. The impacted element is the function simpan of the file application/modules/admin/controllers/routing_pages.php of the component Admin Routin…
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Low 2.4
gedelumbung HospitalManagement Settings sistem.php simpan cross site scripting
A vulnerability was identified in gedelumbung HospitalManagement up to c2d45543789a3887067d3915f69d44cfc2cf76a8. The affected element is the function sistem.php::simpan of the file application/modules/admin/controllers/sistem.php of the component Settings Han…
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Medium 4.3
gedelumbung HospitalManagement Contact Form contact.php kirim cross site scripting
A vulnerability was determined in gedelumbung HospitalManagement up to c2d45543789a3887067d3915f69d44cfc2cf76a8. Impacted is the function kirim of the file application/modules/web/controllers/contact.php of the component Contact Form. Executing a manipulation…
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Low 3.5
Vikunja 2.2.0 before 2.7.1 HTML Injection via Notification Email Header
Vikunja 2.2.0 before 2.7.1 contains an HTML injection vulnerability in CreateConversationalHeader in pkg/notifications/mail.go that interpolates display names and task and project titles raw into email anchors. Authenticated users can craft titles or display …
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Medium 6.1
Mistune before 3.3.0 Stored XSS via Include Directive HTML Files
Mistune before 3.3.0 contains a cross-site scripting vulnerability in the Include directive that emits included .html, .xhtml, or .htm file content as raw block_html tokens. Attackers who can plant an HTML file readable by the renderer can reference it via an…
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Medium 5.5
Authenticated Stored Cross-Site Scripting (XSS) Vulnerability in AOS Web-Based Management Interface
A stored cross-site scripting (XSS) vulnerability exists in the web-based management interface of AOS that could allow an authenticated remote attacker with high privileges to inject malicious scripts. Successful exploitation could allow an attacker to execut…
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High 8.1
Agent Zero Web UI XSS
The Agent Zero Web UI before 1.15 does not correctly sanitize user-provided input in chat messages or file uploads. When Agent Zero reproduces content in the chat interface, any injected JavaScript is executed in the context of the victim’s authenticated Agen…
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High 8.7
OpenCATS before 0.12.0 Stored XSS via MRU Navigation Panel
OpenCATS before 0.12.0 contains a stored cross-site scripting vulnerability that allows a low-privileged authenticated user to inject HTML/JavaScript payloads by setting a Candidate, Company, Contact, Job Order, or List name/title field, which is stored unsan…
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Low 3.5
subhajitkhan online-clinic-management-system patdocmsg.php cross site scripting
A weakness has been identified in subhajitkhan online-clinic-management-system up to e9ee77a8827a1446220fa07ee693dc4d9a29a578. This affects an unknown part of the file patdocmsg.php. Executing a manipulation of the argument Query can lead to cross site script…
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Medium 6.1
Retool < 3.88.0 XSS via /api/imageProxy SVG Proxying
Retool before 3.88.0 contains a cross-site scripting vulnerability that allows unauthenticated attackers to execute scripts by proxying malicious SVG files through /api/imageProxy. Attackers can supply an attacker-hosted SVG in the url parameter, which is ser…
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Medium 6.1
WPML Multilingual CMS WordPress Plugin < 4.6.1 Reflected XSS via wp-login.php wp_lang
WPML Multilingual CMS plugin for WordPress before 4.6.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject script by supplying crafted input in the wp_lang parameter. Attackers can lure users to /wp-login.p…
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Medium 6.1
Sickbeard build-507 Reflected XSS via testNaming pattern Parameter
Sickbeard through build-507 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the pattern parameter of /config/postProcessing/testNaming. Attackers can craft GET requests with malicious SVG…
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Medium 6.1
Discourse < 1.9.0.beta13 Reflected XSS via /email/unsubscribed
Discourse 1.9.0.beta2 before 1.9.0.beta13 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the email parameter of /email/unsubscribed. Attackers can craft GET requests with SVG onload payl…
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Medium 6.1
QCubed 3.1.1 Reflected XSS via installer step_2.php
QCubed 2.2.0 through 3.1.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the installation_path parameter. Attackers can craft GET requests to /assets/php/_devtools/installer/step_2.php …
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High 7.1
WordPress ACF Extended plugin <= 0.9.2.7 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ACF Extended ACF Extended acf-extended allows Stored XSS.This issue affects ACF Extended: from n/a through 0.9.2.7.
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Medium 6.5
WordPress Extensions for Leaflet Map plugin <= 6.0 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in hupe13 Extensions for Leaflet Map extensions-leaflet-map allows Stored XSS.This issue affects Extensions for Leaflet Map: from n/a through 6.0.
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Medium 6.5
WordPress ND Shortcodes For Visual Composer plugin <= 7.8 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in nicdark ND Shortcodes For Visual Composer nd-shortcodes allows Stored XSS.This issue affects ND Shortcodes For Visual Composer: from n/a through 7.8.
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Medium 6.5
WordPress Waitlist Woocommerce ( Back in stock notifier ) plugin <= 2.9.1 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in xootix Waitlist Woocommerce ( Back in stock notifier ) waitlist-woocommerce allows Stored XSS.This issue affects Waitlist Woocommerce ( Back in stock notifie…
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Medium 6.5
WordPress Restaurant Menu – Food Ordering System – Table Reservation plugin <= 2.4.4 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Gloriafood Restaurant Menu – Food Ordering System – Table Reservation menu-ordering-reservations allows Stored XSS.This issue affects Restaurant Menu – Food …
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High 7.1
WordPress WP Mailster plugin <= 1.9.1.0 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WP Mailster WP Mailster wp-mailster allows Stored XSS.This issue affects WP Mailster: from n/a through 1.9.1.0.
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Medium 6.5
WordPress Off-Canvas Sidebars & Menus (Slidebars) plugin <= 0.5.9 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Jory Hogeveen Off-Canvas Sidebars & Menus (Slidebars) off-canvas-sidebars allows Stored XSS.This issue affects Off-Canvas Sidebars & Menus (Slidebars): from …
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High 7.1
WordPress Contact Form Email plugin <= 1.3.68 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Codepeople Contact Form Email contact-form-to-email allows Stored XSS.This issue affects Contact Form Email: from n/a through 1.3.68.
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Medium 6.5
WordPress H5P plugin <= 1.17.9 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in H5P H5P h5p allows Stored XSS.This issue affects H5P: from n/a through 1.17.9.
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Medium 6.5
WordPress Elementor Addon Elements plugin <= 1.14.4 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPVibes Elementor Addon Elements addon-elements-for-elementor-page-builder allows Stored XSS.This issue affects Elementor Addon Elements: from n/a through 1.…
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Medium 6.8
Photo Engine < 6.5.8 - Author+ Stored XSS via Collection Name
The Photo Engine (Media Organizer & Lightroom) WordPress plugin before 6.5.8 does not sanitise and escape collection and gallery names before storing them and outputting them in an administrative dashboard, allowing authenticated users with the author role an…
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High 7.5
WebP Express < 0.25.16 - Unauthenticated Stored XSS via Alter HTML Parser
The WebP Express WordPress plugin before 0.25.16 does not escape values that its bundled HTML parser re-emits into element attributes when a non-default image delivery mode is enabled, allowing unauthenticated users to submit content that is stored and later …
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Medium 6.8
Link Library < 7.9.6 - Contributor+ Stored XSS via 'link_target' Parameter
The Link Library WordPress plugin before 7.9.6 does not sanitise and escape a link field before outputting it inside an attribute of a link preview, allowing users with the Contributor role and above to perform Stored Cross-Site Scripting attacks. The preview…
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High 7.2
PixelYourSite (Free & Pro) - Unauthenticated Stored XSS via Cookie
The PixelYourSite WordPress plugin before 11.4.3, PixelYourSite Pro WordPress plugin before 12.6.8 do not sanitise and escape a cookie value before printing it into the page output, which, on a site running a full-page cache, allows unauthenticated attackers …
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Medium 4.9
WordPress Core <= 7.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Quick Edit
WordPress Core is vulnerable to Stored Cross-Site Scripting via Quick Edit in all versions up to, and including, 7.0.2 due to insufficient escaping of user display names. This makes it possible for authenticated attackers, with Contributor-level access and ab…
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Medium 4.7
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a cross-site scripting vulnerability in the passw…
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Low 3.1
AI (Artificial Intelligence) - Moderately critical - Cross site scripting - SA-CONTRIB-2026-119
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal AI (Artificial Intelligence) allows Stored XSS. This issue affects AI (Artificial Intelligence) versions: from 0.0.0 to 1.3.13, from 1.4.0 to 1.4.8.
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Medium 4.6
Component blocks - Moderately critical - Cross site scripting - SA-CONTRIB-2026-123
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Component blocks allows Stored XSS. This issue affects Component blocks versions: from 0.0.0 to 1.2.7.
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Medium 5.4
Email Verification / SMS Verification / OTP Verification - Critical - Cross Site Scripting - SA-CONTRIB-2026-125
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Email Verification / SMS Verification / OTP Verification allows Reflected XSS. This issue affects Email Verification / SMS Verification / OTP Verifica…
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Medium 4.6
PhotoSwipe - Responsive JavaScript Modal Image Gallery - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-131
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal PhotoSwipe - Responsive JavaScript Modal Image Gallery allows Stored XSS. This issue affects PhotoSwipe - Responsive JavaScript Modal Image Gallery ve…
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Medium 4.2
Feed Block - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-137
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Feed Block allows Stored XSS. This issue affects Feed Block versions: from 0.0.0 to 2.0.2, from 3.0.0 to 3.0.2.
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Medium 4.6
SafeDelete - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-140
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal SafeDelete allows Stored XSS. This issue affects SafeDelete versions: from 0.0.0 to 1.0.88.
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Low 3.5
SAML SSO - Service Provider - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-146
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal SAML SSO - Service Provider allows Cross-Site Scripting (XSS). This issue affects SAML SSO - Service Provider versions: from 0.0.0 to 3.2.0.
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Low 3.3
SAML SSO - Service Provider - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-147
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal SAML SSO - Service Provider allows Cross-Site Scripting (XSS). This issue affects SAML SSO - Service Provider versions: from 0.0.0 to 3.2.0.
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Medium 4.6
Webform - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-155
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Webform allows Cross-Site Scripting (XSS). This issue affects Webform versions: from 0.0.0 to 6.2.12, from 6.3.0 to 6.3.1.