CVE-2026-42560
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.42%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.42% probability · 35th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Source
- security-advisories@github.com
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.