CVE-2026-15783 PUBLISHED

Missing Authorization vulnerability was identified in GitHub Enterprise Server that allowed reading private repository metadata via delegated bypass rule suites

Assigner: GitHub_P
Reserved: 14.07.2026 Published: 17.07.2026 Updated: 17.07.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 5.3

Product Status

Vendor GitHub
Product Enterprise Server
Versions Default: affected
  • affected from 3.17.0 to 3.17.17 (incl.)
  • affected from 3.18.0 to 3.18.11 (incl.)
  • affected from 3.19.0 to 3.19.8 (incl.)
  • affected from 3.20.0 to 3.20.4 (incl.)
  • affected from 3.21.0 to 3.21.2 (incl.)

Credits

  • Ahmed Mamdoh (0hmz) finder

References

Problem Types

  • CWE-862 Missing Authorization CWE

Impacts

  • CAPEC-180 Exploiting Incorrectly Configured Access Control Security Levels