CVE-2026-5845Improper authorization fallback allows scoped user-to-server token installation escape in GitHub Enterprise Server
- 7.2HighCVSS base score
- 0.29%Exploitation in 30 daysEPSS · top 78% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By GitHub_P
- 13 days later
· 13 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_PCNA (assigner) | 4.0 | High7.2 | 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 |
| NVDNVD · Analyzed | 4.0 | High7.2 | 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:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.29% · top 78% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.
Affected products
- affected 3.20.0 – < 3.20.1
- affected 3.19.0 – ≤ 3.19.4
- affected 3.18.0 – ≤ 3.18.7
- affected 3.17.0 – ≤ 3.17.13
- affected 3.16.0 – ≤ 3.16.16
- affected 3.15.0 – ≤ 3.15.20
- affected 3.14.0 – ≤ 3.14.25
References
References7
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.1 (opens in a new tab)
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.5 (opens in a new tab)
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.8 (opens in a new tab)
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.14 (opens in a new tab)
- https://docs.github.com/en/[email protected]/admin/release-notes#3.16.17 (opens in a new tab)
- https://docs.github.com/en/[email protected]/admin/release-notes#3.15.21 (opens in a new tab)
- https://docs.github.com/en/[email protected]/admin/release-notes#3.14.26 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-24552 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-5845)Record last updated .