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CVE-2026-55691— EmbedVideo Extension : Stored XSS via unsanitized class passed to template

Quick assessment

Affected
StarCitizenWiki mediawiki-extensions-EmbedVideo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

EmbedVideo 扩展是一个 MediaWiki 扩展，它添加了名为 的解析器函数以及多种解析器标签，用于从各类视频共享服务嵌入视频片段。在 4.1.0 版本之前， 中的 方法在构建 元素时，将用户提供的 值直接传递给 。如果 值中包含引号，可能会提前终止 属性，从而向渲染后的页面注入任意的 HTML 属性或标记。能够编辑 wiki 页面的用户可以在页面上存储 JavaScript 代码，这些代码会在访问者渲染受影响内容时执行。该问题已在 4.1.0 版本中修复。

CVSS 8.6 · High

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-55691

Vulnerability Information
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Vulnerability Title
EmbedVideo Extension : Stored XSS via unsanitized class passed to template
Source: CVE Program / CVE List V5
Vulnerability Description
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/EmbedHtmlFormatter.php passes the user-supplied class value directly to sprintf while constructing a figure element. A quote in the class value can terminate the class attribute and inject arbitrary HTML attributes or markup into the rendered page. A user able to edit a wiki page can store JavaScript that executes for visitors who render the affected content. This issue is fixed in version 4.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
StarCitizenWiki mediawiki-extensions-EmbedVideo < 4.1.0 -

II. Public POCs for CVE-2026-55691

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III. Intelligence Information for CVE-2026-55691

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Patches & Fixes for CVE-2026-55691 (1)

Vendor Advisories for CVE-2026-55691 (1)

Vendor Pages for CVE-2026-55691 (1)

Same Patch Batch · StarCitizenWiki · 2026-09-15 · 3 CVEs total

CVE-2026-55690 7.5 HIGH EmbedVideo Extension: Stored XSS via unsanitized service name in exception text
CVE-2026-55692 7.5 HIGH EmbedVideo Extension: Stored XSS via malformed src url with $wgEmbedVideoRequireConsent en

IV. Related Vulnerabilities

Same product: mediawiki-extensions-EmbedVideo
Same vendor: StarCitizenWiki
Same weakness: CWE-79

V. Comments for CVE-2026-55691

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