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)
-
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.
-
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-80
691 results · Feed
-
Medium 5.4
Cross-Site Scripting via ListBox Bound Text in Kendo UI for jQuery
In Progress® Kendo® UI for jQuery releases starting with R1 2020 and prior to 2026.3.1015, the ListBox default item template renders the bound dataTextField value as raw HTML without encoding. An attacker who can modify the bound data can supply HTML containi…
-
Medium 5.4
Cross-Site Scripting via Badge Text Binding in Kendo UI for jQuery
In Progress® Kendo® UI for jQuery releases starting with v2020.1.114 and prior to 2026.3.1015, the Badge text method renders string values as raw HTML without encoding, including values supplied through text binding. An attacker who can modify data bound to a…
-
Medium 4.7
Cross-Site Scripting via ToolBar ButtonGroup URLs in Kendo UI for jQuery
In Progress® Kendo® UI for jQuery versions starting with 2022.3.1109 and prior to 2026.3.1015, ToolBar ButtonGroup button URLs are concatenated into an unquoted href attribute after URL sanitization. An attacker who can control a button URL can supply an othe…
-
Medium 4.7
Cross-Site Scripting via Scheduler Resource Colors in Kendo UI for jQuery
In Progress® Kendo® UI for jQuery, in v2026.3.811 and earlier, the Scheduler Day, Timeline, Month, and Agenda views insert resource color values into quoted event wrapper attributes without proper encoding. An attacker who can control a resource color can inj…
-
Medium 4.7
Cross-Site Scripting via PanelBar Item URLs in Kendo UI for jQuery
In Progress® Kendo® UI for jQuery versions starting with 2019.2.514 and prior to 2026.3.1015, the PanelBar component inserts data source item URL values into a single-quoted href attribute without proper encoding. An attacker who can control an item URL can i…
-
Medium 4.7
Cross-Site Scripting in FileManager Drag Hints in Kendo UI for jQuery
In Progress® Kendo® UI for jQuery versions starting with 2023.3.1010 and prior to 2026.3.1015, the FileManager component renders remotely supplied item names as HTML in its default drag hint even though the corresponding list items are encoded. An attacker wh…
-
Medium 6.5
Cross-site Scripting (XSS) in Kendo UI for jQuery FileBrowser and ImageBrowser
In Progress® Kendo® UI for jQuery versions starting with v2023.1.117 and prior to v2026.3.1015, the FileBrowser and ImageBrowser components render remotely supplied file and directory names as HTML without proper encoding. An attacker-controlled name containi…
-
Critical 9.8
Vitess vttablet /twopcz reflected XSS
Vitess is a database clustering system for horizontal scaling of MySQL. Prior to 23.0.5 and 24.0.2, twopczHandler in go/vt/vttablet/tabletserver/twopcz.go writes the Action and dtid form values from the vttablet and vtcombo /twopcz HTTP debug endpoint into a …
-
Medium 4.8
Frappe before 13.46.1 XSS via html2text Weak Sanitization
Frappe before 13.46.1 and 14.x before 14.20.0 contains a cross-site scripting vulnerability because the html2text function weakly sanitizes user input. Authenticated attackers can supply crafted HTML that is insufficiently sanitized by html2text, executing sc…
-
Medium 6.1
Cohesity - CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Cohesity NetBackup Administration Console web interface. This issue affects NetBackup Administration Console web interface: versions before 11.2. https://github.co…
-
Medium 5.4
Cross-Site Scripting via Chart Tooltip in Kendo UI for Vue
In Progress® Kendo UI for Vue (@progress/kendo-vue-charts) starting with version 2.5.0 and prior to 16.2.0, the default Chart tooltip renders the formatted point value as raw HTML without encoding, in both the single-point and the shared tooltip. An attacker …
-
Medium 5.4
Cross-Site Scripting via Chart Tooltip in KendoReact
In Progress® KendoReact (@progress/kendo-react-charts) starting with version 1.1.0 and prior to 16.2.0, the default Chart tooltip renders the formatted point value as raw HTML without encoding, in both the single-point and the shared tooltip. An attacker with…
-
Medium 6.1
League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass
League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Markdown to bypass the DisallowedRawHtml extension by ending raw HTML with a bare disallowed tag name. Attackers can place a lone <script or <if…
-
Low 3.5
HTML Injection in İzometri Informatics' eimzamip
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in İzometri IT Services Domestic and Foreign Trade Co. Ltd. Eimzamip allows Stored XSS. This issue affects eimzamip: from v1.6.4 before v1.6.7.
-
Low 1.2CVE-2026-103585 Public exploit
attacker-controlled javascript license URL via XSS
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki MediaSearch extension allows Cross-Site Scripting (XSS). This issue affects MediaWiki MediaSearch extension: 1.46, 1.45, and 1.43.
-
Low 1.1CVE-2026-103584 Public exploit
attacker-controlled javascript license URL via XSS
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki CommonsMetadata extension allows Cross-Site Scripting (XSS). This issue affects MediaWiki CommonsMetadata extension: 1.46, 1.45, …
-
Low 0.3
Various rawParams() and escaped() updates to prevent XSS in Wikibase extension
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Wikbase extension allows Cross-Site Scripting (XSS). This issue affects MediaWiki Wikbase extension: 1.46, 1.45, and 1.43.
-
Low 0.3
Various rawParams() and escaped() updates to prevent XSS in Wikistories extension
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Wikistories extension allows Cross-Site Scripting (XSS). This issue affects MediaWiki Wikistories extension: 1.46, 1.45, and 1.43.
-
Low 1.1CVE-2026-103437 Public exploit
ReadingLists imported metadata permits JavaScript URL XSS
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki ReadingLists extension allows Reflected XSS. This issue affects MediaWiki ReadingLists extension: 1.46 and 1.45.
-
Low 1.2CVE-2026-103445 Public exploit
Stored XSS through PageForms #autoedit redirect links
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Page_Forms extension allows Stored XSS. This issue affects MediaWiki Page_Forms extension: 1.46, 1.45, and 1.43.
-
Low 1.1
Stored XSS through system messages in WikiForum
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki WikiForum extension allows Stored XSS. This issue affects MediaWiki WikiForum extension: master.
-
Low 1.1
API permits session-seeded javascript URL XSS
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Collection (Book) extension allows XSS Targeting Non-Script Elements. This issue affects MediaWiki Collection (Book) extension: 1…
-
Low 2.7
WordPress Astra WordPress theme theme <= 4.13.12 - Content Injection vulnerability
Shop manager Content Injection in Astra WordPress Theme <= 4.13.12 versions.
-
Low 2.3
Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script> in serialized function bodies
Serialize JavaScript serializes JavaScript values to a superset of JSON that includes regular expressions and functions. From 7.1.1 until 7.1.2, function values serialized by serialize-javascript are not fully protected against script-closing tags in attacker…
-
Low 3.1
Laravel: XSS in Debug Page Information
Laravel is a web application framework. Prior to 12.69.0 and 13.30.0, Laravel exception debug pages with APP_DEBUG=true pass attacker-controlled input to a Tippy.js tooltip configured with allowHTML true, enabling DOM-based cross-site scripting when a user ho…
-
Medium 5.3
Zammad: Stored XSS via unescaped option labels in the object attribute options context UI
Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, unsanitized option labels are rendered in the configuration dialogs of AI Agents within Zammad's admin UI. When rendering the list of selected options, the option label is out…
-
High 7.5
Mediawiki EmbedVideo Extension has stored XSS via malformed src url with $wgEmbedVideoRequireConsent disabled
The EmbedVideo Extension is a MediaWiki extension which adds a parser function called #ev and various parser tags for embedding video clips from various video sharing services. Prior to 4.1.0, with $wgEmbedVideoRequireConsent disabled (not the default), the u…
-
Critical 9.3
Home Assistant: XSS in Statistics Graph Card
Home Assistant is open source home automation software focused on local control and privacy. Prior to 2026.7.0, the Statistics Graph card in src/components/chart/statistics-chart.ts passed entity names through getStatisticLabel and computeStateName and interp…
-
High 7.5
GoCD has stored XSS possible via tracking tool link highlighting on Compare Pipeline pages
GoCD is a continuous deliver server. From 18.3.0 until 26.1.0, GoCD can generate unescaped tracking-tool links from commit comments when a project uses a lenient Tracking Tool regular expression with an ID capturing group, such as JIRA-(.+). An attacker with …
-
High 7.0
GoCD has stored XSS possible via forged package material comments on Stage/Job/VSM pages
GoCD is a continuous deliver server. From 13.3.0 until 26.1.0, GoCD does not correctly encode and escape malicious material modification comments that mimic the special trackback format used by package materials when rendering the Stage Detail, Job/Build Deta…
-
Medium 5.4
Multiple security vulnerabilities are addressed with IBM Cloud Pak for Business Automation iFixes for August 2026.
IBM Cloud Pak for Business Automation 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.
-
Medium 4.3
plone.app.textfield: Stored XSS by spoofing mime type
plone.app.textfield provides a zope.schema-style field type called RichText for storing a value with a related MIME type. Prior to 2.0.2, 3.0.2, and 4.0.1, depending on the release line, RichTextValue.output returns an unsanitized stored RichText value when m…
-
High 8.6
EmbedVideo Extension : Stored XSS via unsanitized class passed to template
The EmbedVideo Extension is a MediaWiki extension which adds a parser function called #ev and various parser tags for embedding video clips from various video sharing services. Prior to 4.1.0, EmbedHtmlFormatter::toHtml in includes/EmbedService/EmbedHtmlForma…
-
High 7.5
EmbedVideo Extension: Stored XSS via unsanitized service name in exception text
The EmbedVideo Extension is a MediaWiki extension which adds a parser function called #ev and various parser tags for embedding video clips from various video sharing services. Prior to 4.1.0, EmbedServiceFactory::newFromName in includes/EmbedService/EmbedSer…
-
High 7.5
EmbedVideo Extension: Stored XSS via malformed src url with $wgEmbedVideoRequireConsent enabled
The EmbedVideo Extension is a MediaWiki extension which adds a parser function called #ev and various parser tags for embedding video clips from various video sharing services. Prior to 4.1.0, with the default $wgEmbedVideoRequireConsent configuration enabled…
-
Medium 6.1
Reflected XSS via Unescaped `id` Parameter in Bazar Widget HTML Attributes in YesWiki
YesWiki is a wiki system written in PHP. Prior to version 4.6.6, YesWiki's Bazar widget handler reflects the id GET parameter into HTML attributes using strip_tags() only. Because strip_tags() does not escape double quotes, an attacker can break out of the at…
-
Medium 6.1CVE-2026-52773 Scanner template
Reflected XSS via Unescaped Archived-Revision `time` Parameter in `handlers/page/show.php` in YesWiki
YesWiki is a wiki system written in PHP. From version 4.1.0 to before version 4.6.6, YesWiki's archived-revision view reflects the time GET parameter into a hidden HTML input in handlers/page/show.php without escaping. Because MySQL coerces malformed DATETIME…
-
Medium 6.1
Apache Spark: XSS Vulnerability in Spark Web 3.5.4
There is a lack of XSS escaping in the Spark History Server prior to 3.5.8 which allows a malicious Spark job to generate arbitrary unescaped frontend code which could lead to a minimal privilege escalation in browser. Users are encouraged to upgrade to Spark…
-
Medium 6.4
Default webserver configuration with incorrect CSP
The default docker image shipped for Venueless did not properly ensure that uploaded SVG files could not be delivered with executable JavaScript content. A valid Content Security Policy is now set.
-
Medium 4.3
PrivateBin: Stored Cross-Side-Scripting (XSS) vulnerability in attachment download link via dangerous MIME types with required user-interaction
PrivateBin is an online pastebin where the server has zero knowledge of pasted data. Prior to 2.0.5, AttachmentViewer.setAttachment in js/privatebin.js uses getAttachmentMimeType to accept attacker-controlled MIME types and uses getBlobUrl to create a same-or…