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CVE-2026-10585

MEDIUM
6.3
CVSS 4.0
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. This vulnerability was reported via the GitHub Bug Bounty program.

Metadata

CVE ID
CVE-2026-10585
State
PUBLISHED
Assigner
GitHub_P
Reserved
2026-06-01 19:08 UTC
Published
2026-06-30 21:39 UTC
Last updated
2026-06-30 22:00 UTC
Primary CWE
CWE-79
CWE-79 Improper neutralization of input during web page gene…
Vendor / Product
GitHub / Enterprise Server
Sources
cve.org  ·  NVD

Severity & Metrics

6.3 MEDIUM CVSS 4.0
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
Affected products (1)
VendorProductPlatformVersions
GitHub Enterprise Server — 3.17.0 ≤ 3.17.16, 3.18.0 ≤ 3.18.10, 3.19.0 ≤ 3.19.7, 3.20.0 ≤ 3.20.3
Weakness (CWE)
CWESourceDescription
CWE-79 cna CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.3 MEDIUM 4.0 cna 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
References (4)
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