CVE-2026-5845
Received
Received - Intake
Improper Authorization in GitHub Enterprise Server Enables Repository Access
Vulnerability report for CVE-2026-5845, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-04-21
Last updated on: 2026-04-29
Assigner: GitHub, Inc. (Products Only)
Description
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 Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| github | enterprise_server | to 3.14.26 (exc) |
| github | enterprise_server | From 3.15.0 (inc) to 3.15.21 (exc) |
| github | enterprise_server | From 3.16.0 (inc) to 3.16.17 (exc) |
| github | enterprise_server | From 3.17.0 (inc) to 3.17.14 (exc) |
| github | enterprise_server | From 3.18.0 (inc) to 3.18.8 (exc) |
| github | enterprise_server | From 3.19.0 (inc) to 3.19.5 (exc) |
| github | enterprise_server | 3.20.0 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-639 | The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. |
