CVE-2026-1355
Description
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.
How to fix
- github enterprise_server3.14.23, 3.15.18, 3.16.14, 3.17.11, 3.18.5, 3.19.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github enterprise_server | v < 3.14.23, 3.15.0 ≤ v < 3.15.18, 3.16.0 ≤ v < 3.16.14, 3.17.0 ≤ v < 3.17.11, 3.18.0 ≤ v < 3.18.5, 3.19.0 ≤ v < 3.19.2 | 3.14.23, 3.15.18, 3.16.14, 3.17.11, 3.18.5, 3.19.2 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.