CVE-2026-10585

published 2026-06-30

CVE-2026-10585: A stored cross-site scripting vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to execute arbitrary JavaScript…

Priority P4 33 medium 6.3 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 E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU X R X V X RE X U X

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 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. This vulnerability was reported via the GitHub Bug Bounty program.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
github	enterprise_server	3.17.0 – 3.17.16	—
github	enterprise_server	3.18.0 – 3.18.10	—
github	enterprise_server	3.19.0 – 3.19.7	—
github	enterprise_server	3.20.0 – 3.20.3	—

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CWE-79