CVE-2026-1355

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-96391 Missing Authorization vulnerability in Drupal Webform REST allows Forceful Browsing. CWE-862
• CVE-2026-96380 Missing Authorization vulnerability in Drupal CSS Usage Analyzer allows Forceful Browsing. CWE-862
• CVE-2026-96386 Missing Authorization vulnerability in Drupal Smart Content allows Forceful Browsing. CWE-862
• CVE-2026-87955 Missing Authorization vulnerability in Drupal Ultimate Table Field allows Forceful… CWE-862
• CVE-2026-87954 Missing Authorization vulnerability in Drupal Taxonomy Term Glossary allows Forceful… CWE-862
• CVE-2026-87943 Missing Authorization vulnerability in Drupal SAML SSO - Service Provider allows Forceful… CWE-862
• CVE-2026-84916 Missing Authorization vulnerability in Drupal Islandora allows Forceful Browsing. CWE-862
• CVE-2026-84921 Missing Authorization vulnerability in Drupal Webform Submissions Delete allows Forceful… CWE-862