CVSS 4.0
6.0 mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:LCVE-2026-1355
Medium (6.0) in github enterprise server. EPSS 0.5% chance of exploitation in the next 30 days.
A Missing Authorization vulnerability was identified in GitHub Enterprise Server that allowed an attacker to upload unauthorized content to another user’s repository migration export due to a missing authorization check in the repository migration upload endpoint. By supplying the migration identifier, an attacker could overwrite or replace a victim’s migration archive, potentially causing victims to download attacker-controlled repository data during migration restores or automated imports. An attacker would require authentication to the victim's GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.20 and was fixed in versions 3.19.2, 3.18.5, 3.17.11, 3.16.14, 3.15.18, 3.14.23. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
- CWE
- CWE-862
- Published
- Modified
- Record from
- the NVD, synced
Affected
- github:enterprise_server
References
- https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.23
- https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.18
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.14
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.11
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.5