CVE-2026-42560

auth provides authentication via oauth2, direct and email. From versions 1.18.0 to before 1.25.2 and 2.0.0 to before 2.1.2, the Patreon OAuth provider maps every authenticated Patreon account to the same local user.ID, instead of deriving a unique ID from the Patreon account returned by Patreon. In practice, this means all Patreon-authenticated users of an application using this library are collapsed into a single local identity. Any application that trusts token.User.ID as the stable account key can end up mixing or fully merging unrelated Patreon users, which can lead to cross-account access, privilege confusion, and subscription-state leakage. This issue has been patched in versions 1.25.2 and 2.1.2.

• CWE-287

• https://github.com/go-pkgz/auth/commit/c0b15ee72a8401da83c01781c16636c521f42698
• https://github.com/go-pkgz/auth/releases/tag/v1.25.2
• https://github.com/go-pkgz/auth/releases/tag/v2.1.2
• https://github.com/go-pkgz/auth/security/advisories/GHSA-f6qq-3m3h-4g42
• https://github.com/go-pkgz/auth/security/advisories/GHSA-f6qq-3m3h-4g42

Published

May 9, 2026

Last Modified

Jul 24, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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