VulnerabilityAnalyzed

CVE-2026-10585

MEDIUM 6.3EPSS 0.32%

Does this matter?

Lower severity and a low EPSS score (0.32%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 6.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.32% probability · 25th percentile
CISA KEV: Not listed
Weakness: CWE-79
Affected: github/enterprise server
Source: product-cna@github.com

References

https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.20Release Notes
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17Release Notes
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11Release Notes
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8Release Notes
https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4Release Notes

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.