CVE-2026-55690— EmbedVideo Extension: Stored XSS via unsanitized service name in exception text
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，它添加了一个名为 的解析器函数以及多种解析器标签，用于嵌入来自各类视频分享服务的视频片段。在 4.1.0 版本之前， （位于 ）会将攻击者可控的未知服务名称插入到异常文本中；而 则通过 HTML 输出路径返回该文本，且未进行中和（neutralization）处理。 解析器函数和 解析器形式均可触发此错误路径。能够编辑 Wiki 页面的用户可以在错误输出中注入存储型 HTML 或 JavaScript，导致在渲染该页面的访问者的浏览器中执行代码（即在 Wi
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-55690
Vulnerability Information
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Vulnerability Title
EmbedVideo Extension: Stored XSS via unsanitized service name in exception text
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, EmbedServiceFactory::newFromName in includes/EmbedService/EmbedServiceFactory.php interpolates an attacker-controlled unknown service name into exception text, and includes/EmbedVideo.php returns that text as HTML through the isHtml output path without neutralization. Both the #ev parser function and the evl parser form can reach this error path. A user able to edit a wiki page can inject stored HTML or JavaScript into the error output, causing code to execute in the wiki origin for visitors who render the page. 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:N/A:N
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-2026-55690
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-55690 (1)
Vendor Pages for CVE-2026-55690 (1)
Same Patch Batch · StarCitizenWiki · 2026-09-15 · 3 CVEs total
| CVE-2026-55691 | 8.6 HIGH | EmbedVideo Extension : Stored XSS via unsanitized class passed to template |
| CVE-2026-55692 | 7.5 HIGH | EmbedVideo Extension: Stored XSS via malformed src url with $wgEmbedVideoRequireConsent en |
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V. Comments for CVE-2026-55690
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