# 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

> 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. CVSS 5.4 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-10585
Last updated: 2026-10-25T21:10:00Z

- Published: 2026-06-30 21:39 UTC · Updated: 2026-10-25 21:10 UTC · Assigner: GitHub\_P
- CVSS: 5.4 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- EPSS: 0.32%, 25th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-79

## 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.

## Affected vendors and products

- GitHub: Enterprise Server

## Tracked companies

- [GitHub](https://rewindex.com/company/github.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-10585)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-10585)
- [https://docs.github.com/en/enterprise-server@3.16/admin/release-notes\#3.16.20](https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.20)
- [https://docs.github.com/en/enterprise-server@3.17/admin/release-notes\#3.17.17](https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17)
- [https://docs.github.com/en/enterprise-server@3.18/admin/release-notes\#3.18.11](https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11)
- [https://docs.github.com/en/enterprise-server@3.19/admin/release-notes\#3.19.8](https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8)
- [https://docs.github.com/en/enterprise-server@3.20/admin/release-notes\#3.20.4](https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-10585 · Markdown: https://rewindex.com/cve/CVE-2026-10585.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-10585 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:43.248Z