CVE-2026-15783

published 2026-07-17

CVE-2026-15783: A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user with write access to any repository to read…

Priority P3 37 medium 5.3 CVSS 4.0

AV N AC L AT N PR L UI N VC L 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 with write access to any repository to read metadata from private repositories they did not have access to, including private repository owners and names, branch names, commit SHAs, commit messages, and the pushing actor. The delegated bypass endpoint resolved a rule suite directly from an attacker-supplied, encoded identifier without verifying that the requesting user could read the rule suite's repository, and because these identifiers are sequential an attacker could enumerate them across the instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.18, 3.18.12, 3.19.9, 3.20.5, and 3.21.3. This vulnerability was reported via the GitHub Bug Bounty program.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
github	enterprise_server	3.17.0 – 3.17.17	—
github	enterprise_server	3.18.0 – 3.18.11	—
github	enterprise_server	3.19.0 – 3.19.8	—
github	enterprise_server	3.20.0 – 3.20.4	—
github	enterprise_server	3.21.0 – 3.21.2	—

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CWE-862