Home→Vulnerabilities→CVE-2026-5845
Critical Risk Disclosed

CVE-2026-5845

An improper authorization vulnerability in scoped user-to-server (ghu_) token authorization in GitHub Enterprise Server allows an authenticated attacker to access private repositories outside the intended installation scope, which can include write operations, via an authorization fallback that treated a revoked/deleted installation as a global installation context, which could be chained with token revocation timing and SSH push attribution to obtain and reuse a victim-scoped token. 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.

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Exploitation Probability (EPSS)

Low Priority
0.02%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

2 events
Apr 21, 2026
Vulnerability Disclosed
Published to component-level vulnerability database.
Apr 29, 2026
Last Updated
Record updated with new analysis or tags.

Threat Actor Attribution

PREMIUM INTEL
Associated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

2 Total
github/enterprise_serverAll Versions
github/enterprise_server3.20.0

References

https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26GitHub
Release NotesVendor Advisory
https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21GitHub
Release NotesVendor Advisory
https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17GitHub
Release NotesVendor Advisory
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14GitHub
Release NotesVendor Advisory

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Vulnerability Details

CVSS Base Score
9.6/ 10
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Published Date
Apr 21, 2026
Last Modified
Apr 29, 2026
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