cbcvebase.
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…

PriorityP430medium5.4CVSS 3.1
AVNACLPRLUIRSCCLILAN
EPSS
0.32%
25.2th percentile
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, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program.

Affected

10 ranges
VendorProductVersion rangeFixed in
githubenterprise_server< 3.16.203.16.20
githubenterprise_server3.16.0 – 3.16.19—
githubenterprise_server>= 3.17.0 < 3.17.173.17.17
githubenterprise_server3.17.0 – 3.17.16—
githubenterprise_server>= 3.18.0 < 3.18.113.18.11
githubenterprise_server3.18.0 – 3.18.10—
githubenterprise_server>= 3.19.0 < 3.19.83.19.8
githubenterprise_server3.19.0 – 3.19.7—
githubenterprise_server>= 3.20.0 < 3.20.43.20.4
githubenterprise_server3.20.0 – 3.20.3—

CVSS provenance

nvdv3.15.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
nvdv4.06.3MEDIUMCVSS: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
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.