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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 6.3 · githubNVD modified 2026-10-25 21:10
Affected (CPE criteria) 1
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
References 5
- https://docs.github.com/en/[email protected]/admin/release-notes#3.16.20 Release Notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.17 Release Notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.11 Release Notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.8 Release Notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.4 Release Notes