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CVE-2026-10585— Stored cross-site scripting vulnerability in GitHub Enterprise Server allowed arbitrary JavaScript execution via crafted Discussion titles in the Q&A category

Quick assessment

Affected
GitHub Enterprise Server
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.

GitHub enterprise server是美国GitHub公司的一款一座企业级代码托管服务器。 GitHub Enterprise Server存在跨站脚本漏洞，该漏洞源于AnsweredQuestionStructuredDataComponent未转义Q&A类别讨论标题，在嵌入到<script type="application/ld+json">块前导致标题可打破脚本环境，利用REST API的JSONP回调支持绕过内容安全策略，导致存储型跨站脚本攻击，允许经过身份验证的攻击者在另一用户浏览

AI Predicted 6.1 Difficulty: Easy EPSS 0.32% · P23

Affected Version Matrix 5

VendorProduct Version RangeStatus
GitHub Enterprise Server 3.17.0≤ 3.17.16 affected
3.18.0≤ 3.18.10 affected
3.19.0≤ 3.19.7 affected
3.20.0≤ 3.20.3 affected
3.16.0≤ 3.16.19 affected
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I. Basic Information for CVE-2026-10585

Vulnerability Information
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Vulnerability Title
Stored cross-site scripting vulnerability in GitHub Enterprise Server allowed arbitrary JavaScript execution via crafted Discussion titles in the Q&A category
Source: CVE Program / CVE List V5
Vulnerability Description
A stored cross-site scripting vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to execute arbitrary JavaScript in another user's browser by injecting a crafted payload into the title of a Discussion in the Q&A category. The AnsweredQuestionStructuredDataComponent did not escape user-controlled Discussion titles before embedding them in a <script type="application/ld+json"> block, allowing the title to break out of the script context. The injection was escalated to a full cross-site scripting attack on GitHub Enterprise Server by leveraging JSONP callback support in the REST API to bypass the Content Security Policy. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA: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
Vulnerability Title
GitHub Enterprise Server 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub enterprise server是美国GitHub公司的一款一座企业级代码托管服务器。 GitHub Enterprise Server存在跨站脚本漏洞，该漏洞源于AnsweredQuestionStructuredDataComponent未转义Q&A类别讨论标题，在嵌入到<script type="application/ld+json">块前导致标题可打破脚本环境，利用REST API的JSONP回调支持绕过内容安全策略，导致存储型跨站脚本攻击，允许经过身份验证的攻击者在另一用户浏览
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitHub Enterprise Server 3.17.0 ~ 3.17.16 -

II. Public POCs for CVE-2026-10585

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III. Intelligence Information for CVE-2026-10585

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Vendor Pages for CVE-2026-10585 (4)

Same Patch Batch · GitHub · 2026-06-30 · 3 CVEs total

CVE-2026-9106 UI misrepresentation vulnerability in GitHub Enterprise Server allowed unauthorized organi
CVE-2026-9132 Missing authorization vulnerability in GitHub Enterprise Server allowed disclosure of priv

IV. Related Vulnerabilities

Same product: Enterprise Server
Same vendor: GitHub
Same weakness: CWE-79

V. Comments for CVE-2026-10585

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