CVE-2026-1355A 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…
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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.
- CVSS
- 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-862
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
github enterprise_server github:enterprise_server | before 3.14.23; from 3.15.0 before 3.15.18; from 3.16.0 before 3.16.14; from 3.17.0 before 3.17.11; from 3.18.0 before 3.18.5; from 3.19.0 before 3.19.2 | NVD |
References
- https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.23product, release-notes
- https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.18product, release-notes
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.14product, release-notes
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.11product, release-notes
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.5product, release-notes
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.2product, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.