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Vulnerability record · CVE-2026-5845 · published 21 April 2026

CVE-2026-5845: Github enterprise server insecure direct object reference vulnerability

Github · Enterprise Server

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.

7.2 CVSS 4.0 High EPSS 0.48% · top 61.1% CWE-639 · Insecure direct object reference
7.2CVSS 4.0 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.github.com/en/[email protected]/admin/release-notes#3.14.26 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.15.21 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.16.17 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.17.14 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.18.8 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.19.5 Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.20.1 Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-5845), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.