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Vulnerability record · CVE-2026-42560 · published 9 May 2026

CVE-2026-42560: Improper authentication vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.58% · top 54.6% CWE-287 · Improper authentication Deferred
9.1CVSS 3.1 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
24 Jul 2026Last modified by NVD

Description

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.

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

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-42560), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.