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CVE-2026-1355

MEDIUM

6.5

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published2/18/2026

Last Modified2/19/2026

Sourcenvd

Honeypot Sightings0

Affected Products

github:enterprise_server

Weaknesses (CWE)

CWE-862

References

https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.23(product-cna@github.com)

https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.18(product-cna@github.com)

https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.14(product-cna@github.com)

https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.11(product-cna@github.com)

https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.5(product-cna@github.com)

https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.2(product-cna@github.com)

IOC Correlations

No correlations recorded

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