CVE-2026-1355

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.

• CWE-862

• 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

Published

Feb 18, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
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