Medium 5.3Published Apr 21, 2026

CVE-2026-5512Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository names via mobile upload policy API

Updated under an hour ago (Oct 27, 2026, 3:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

An improper authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to determine the names of private repositories by their numeric ID. The mobile upload policy API endpoint did not perform an early authorization check, and validation error messages included the full repository name for repositories the caller did not have access to. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS: 5.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N
Weakness (CWE): CWE-201
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_P
NVD analysis: Analyzed
Record last updated: Apr 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

GitHub Enterprise Server github:enterprise_server (from the name)	from 3.14.0 through 3.14.25; fixed at 3.14.26; from 3.15.0 through 3.15.20; fixed at 3.15.21; from 3.16.0 through 3.16.16; fixed at 3.16.17; from 3.17.0 through 3.17.13; fixed at 3.17.14; from 3.18.0 through 3.18.7; fixed at 3.18.8; from 3.19.0 through 3.19.4; fixed at 3.19.5; from 3.20.0 before 3.20.1; fixed at 3.20.1	CNA record
github enterprise_server github:enterprise_server	before 3.14.26; from 3.15.0 before 3.15.21; from 3.16.0 before 3.16.17; from 3.17.0 before 3.17.14; from 3.18.0 before 3.18.8; from 3.19.0 before 3.19.5; 3.20.0	NVD

References

References

https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26	release-notes, vendor-advisory
https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21	release-notes, vendor-advisory
https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17	release-notes, vendor-advisory
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14	release-notes, vendor-advisory
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8	release-notes, vendor-advisory
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5	release-notes, vendor-advisory
https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1	release-notes, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.