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)
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
Implementation
With Struts, write all data from form beans with the bean's filter attribute set to true.
-
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
32,781 results · Feed
-
Medium 6.4
Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'custom_id' Shortcode Attribute
The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'custom_id' shortcode attribute of the dslc_modules_section and dslc_modules_area shortcodes in versions up to, and including, 2.1.19.…
-
Medium 6.4
User Profile Builder <= 4.0.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'date' Shortcode Attribute
The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'date' Shortcode Attribute in all versions up to, and including, 4.0.0 due to insufficient inp…
-
High 7.2
Listdom: AI-powered Business Directory with Classifieds Ads Listings <= 5.8.1 - Unauthenticated Stored Cross-Site Scripting via 'lsd[displ][style]' Parameter
The Listdom: AI-powered Business Directory with Classifieds Ads Listings plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'lsd[displ][style]' Parameter in all versions up to, and including, 5.8.1 due to insufficient input sanitization and…
-
Medium 5.4
Sulu: Stored XSS via media download inline-disposition override
Sulu is an open-source PHP content management system based on the Symfony framework. Prior to versions 2.6.25 and 3.0.8, src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php allows the /media/{id}/download/{slug} route and its administration varia…
-
High 7.1
WordPress WordPress Social Login and Register plugin <= 7.8.2 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in WordPress Social Login and Register <= 7.8.2 versions.
-
High 7.1
WordPress SliceWP plugin <= 1.2.10 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in SliceWP <= 1.2.10 versions.
-
High 7.1CVE-2026-82221 Public exploit
WordPress RegistrationMagic plugin <= 6.0.9.8 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in RegistrationMagic <= 6.0.9.8 versions.
-
Medium 6.5
WordPress Kalles Addons plugin <= 1.0.6 - Cross Site Scripting (XSS) vulnerability
Subscriber Cross Site Scripting (XSS) in Kalles Addons <= 1.0.6 versions.
-
High 7.1
WordPress Tailored Tools plugin <= 3.0.2 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Tailored Tools <= 3.0.2 versions.
-
High 7.1
WordPress Super Store Finder plugin <= 7.10 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Super Store Finder <= 7.10 versions.
-
High 7.1
WordPress Email Essentials plugin <= 6.0.6 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Email Essentials <= 6.0.6 versions.
-
High 7.1
WordPress LeadConnector plugin <= 4.0.5 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in LeadConnector <= 4.0.5 versions.
-
High 7.1
WordPress Uncode theme <= 2.12.7 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Uncode <= 2.12.7 versions.
-
High 7.1
WordPress Email Subscribers & Newsletters plugin <= 5.9.33 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Email Subscribers & Newsletters <= 5.9.33 versions.
-
Medium 5.1
Livewire DOM-based cross-site scripting during client-side state handling
Livewire is a full-stack framework for Laravel. From 3.0.0-beta.1 until 3.8.3 and 4.3.4, the dot-notated query-string parser in js/plugins/history/index.js, including fromQueryString() and insertDotNotatedValueIntoData(), accepts the __proto__, constructor, a…
-
Medium 4.4
backpack/crud: SingleBase64Image accepts any base64 payload behind a `data:image` prefix — SVG-with-script lands on the public disk
backpack/crud provides Create, Read, Update & Delete (CRUD) functions for Backpack, a collection of Laravel packages that help users build custom administration panels. From 6.0.0 until 6.8.14 and 7.0.37, the src/app/Library/Uploaders/SingleBase64Image.php me…
-
Medium 4.3
Typora Mermaid Rendering cross site scripting
A vulnerability was found in Typora up to 1.13.8/1.14.6. This vulnerability affects unknown code of the component Mermaid Rendering Engine. The manipulation of the argument classDef/style results in cross site scripting. The attack may be launched remotely. T…
-
Medium 4.3
code-projects Online Shopping System Newsletter Subscription offersmail.php cross site scripting
A vulnerability was found in code-projects Online Shopping System 1.0. Affected by this vulnerability is an unknown functionality of the file /offersmail.php of the component Newsletter Subscription. The manipulation of the argument email results in cross sit…
-
High 8.6
Joomla Extension - joomshaper.com - Stored Cross-Site Scripting (XSS) in MegaMenu Layout Container & Embed Inputs in Helix Ultimate < 2.2.11
Joomla Extension - joomshaper.com - Stored Cross-Site Scripting (XSS) in MegaMenu Layout Container & Embed Inputs in Helix Ultimate < 2.2.11 - Unsanitized column and item configuration values stored within the MegaMenu layout JSON were rendered without comple…
-
Medium 6.1
Apache Wicket: XSS in AbstractSingleSelectChoice via getNullValidDisplayValue
Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.markup.html.form.AbstractSingleSelectChoice, the base class of DropDownChoice, writes the body of the default option — the entry shown when no choice is selected —…
-
Medium 5.1
Apache Wicket: XSS in Palette via getAdditionalAttributes
Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.extensions.markup.html.form.palette.component.AbstractOptions, which renders the two option lists of a Palette, escapes the id and the display value of each option…
-
Medium 5.1
Apache Wicket: XSS in AutoLabelTextResolver via FormComponent.setLabel
Improper neutralization of input during web page generation in Apache Wicket. The <wicket:label> tag is provided by org.apache.wicket.markup.html.form.AutoLabelTextResolver, which is registered by default in every WebApplication. The resolver writes the label…
-
Medium 5.1
Apache Wicket: XSS in MetaDataHeaderItem via addTagAttribute
Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.markup.head.MetaDataHeaderItem generates <meta> and <link> header tags. It escaped the attribute names it wrote, but ran the attribute values through a replacement…
-
Medium 5.1
Apache Wicket: XSS in Button via its model object
Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.markup.html.form.Button clears the escape-model-strings flag in its constructor, so that the value attribute it writes is not encoded twice — ComponentTag already …
-
Medium 5.1
Apache Wicket: XSS in AjaxEditableLabel and its subclasses via IChoiceRenderer and defaultNullLabel
AjaxEditableChoiceLabel in wicket-extensions, when constructed with a non-null IChoiceRenderer, writes the display value obtained from that renderer into the label's markup without applying the HTML escaping Wicket performs by default for component model valu…
-
Medium 5.4
Aix-DB through 1.2.4 Stored Cross-Site Scripting via Markdown
Aix-DB through 1.2.4 renders markdown with raw HTML enabled into v-html bindings without sanitization, allowing stored cross-site scripting attacks. Attackers can inject malicious HTML and JavaScript through markdown content in chat responses, skill descripti…
-
Medium 6.1
@pdfme/schemas before 5.5.9 Cross-Site Scripting via SVG
@pdfme/schemas before 5.5.9 contains a cross-site scripting vulnerability in the SVG schema plugin that renders user-supplied SVG content directly to innerHTML without sanitization. Attackers can inject malicious SVG with embedded scripts, event handlers, or …
-
Medium 6.1
@pdfme/schemas before 5.5.9 Cross-Site Scripting via Select
@pdfme/schemas before 5.5.9 contains a cross-site scripting vulnerability in the Select schema plugin that fails to sanitize option values before interpolating them into HTML via innerHTML. Attackers can supply malicious templates with crafted option values c…
-
Medium 4.4
pdfme schemas before 5.5.10 Cross-Site Scripting via i18n Label
pdfme schemas before 5.5.10 contains a cross-site scripting vulnerability in the multiVariableText property panel that assigns unsanitized i18n label values to innerHTML. Attackers who control label overrides through options.labels can inject arbitrary JavaSc…
-
Medium 4.3
yaojingang GEOFlow JSON-LD Theme HomeController.php cross site scripting
A security vulnerability has been detected in yaojingang GEOFlow up to 2.1.0. This affects an unknown part of the file app/Http/Controllers/Site/HomeController.php of the component JSON-LD Theme Handler. The manipulation of the argument Search leads to cross …
-
Medium 4.3
code-projects Simple Inventory System User Registration register.php cross site scripting
A vulnerability has been found in code-projects Simple Inventory System 1.0. This affects an unknown part of the file /register.php of the component User Registration. Such manipulation of the argument last_name leads to cross site scripting. The attack may b…
-
Medium 5.4
A Stored Cross-Site Scripting (XSS) Vulnerability in Nokia NSP
NSP is vulnerable to a stored XSS due to insufficient validation or encoding of user-controlled input in a workflow application. An authenticated attacker with access to the workflow application could embed harmful code that runs when another user views the c…
-
Low 3.5
code-projects Employee Leave Managing System Employee Profile Update editaction.php cross site scripting
A security vulnerability has been detected in code-projects Employee Leave Managing System 1.0. Affected is an unknown function of the file /EmpManageSys/editaction.php of the component Employee Profile Update. The manipulation of the argument Name leads to c…
-
High 8.4
Stored XSS in AshAdmin relationship typeahead via unescaped label_field content
Stored Cross-site Scripting vulnerability in ash-project ash_admin executes attacker-supplied record content as script in an administrator's browser. The relationship typeahead components AshAdmin.Components.Resource.RelationshipField and AshAdmin.Components.…
-
Medium 4.3
SeaCMS err.php cross site scripting
A weakness has been identified in SeaCMS up to 13.6. This affects an unknown part of the file /err.php. Executing a manipulation of the argument errtxt can lead to cross site scripting. The attack can be launched remotely. The exploit has been made available …
-
Medium 6.1
TechStore 1.0 is vulnerable to Cross Site Scripting (XSS). In contact_display, the application echoes the id parameter …
-
Medium 5.4
Stored Cross-Site Scripting (XSS) in TaskRunHandler.post() in web/handlers/task.py in QD 20220208 through 20250803. Whe…
-
Medium 4.3
SourceCodester Queue Management System add_customer.php cross site scripting
A flaw has been found in SourceCodester Queue Management System 1.0. This affects an unknown part of the file /api/add_customer.php. This manipulation of the argument Name causes cross site scripting. It is possible to initiate the attack remotely. The exploi…
-
High 8.9
SiYuan before v3.8.1 Stored XSS via block name
SiYuan before v3.8.1 fails to properly escape block name, alias, and memo fields in hint, backlink, and breadcrumb rendering functions. Attackers can set a block's name to contain HTML/script tags that execute when another user views documents referencing or …
-
High 8.9
SiYuan before v3.8.1 Stored XSS via confirmDialog
SiYuan before v3.8.1 contains a stored cross-site scripting vulnerability in confirmDialog() where unescaped package names and notebook names are interpolated directly into innerHTML assignments. Attackers can submit malicious bazaar packages with HTML/script…