CVE-2026-9132

published 2026-06-30

CVE-2026-9132: A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user to read source code from private…

Priority P3 37 medium 6 CVSS 4.0

AV N AC L AT P PR L UI N VC H VI N VA N SC N SI N 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 missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user to read source code from private repositories they did not have access to. The
Copilot pull request description diff summary endpoint accepted a cross-repository comparison range and rendered the resulting diff without verifying that the requesting user was authorized to view
the target repository. Exploitation required an authenticated account on the instance with read access to at least one repository to use as the comparison base. This vulnerability affected all
versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.17.17, 3.18.11, 3.19.8, and 3.20.4. 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	—

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.

CWE-862