What’s Vulnerable › Vulnerabilities

CVE-2026-42560: auth: Patreon provider assigns the same local user ID to every authenticated Patreon account, enabling cross‑user impersonation

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-09 · updated 2026-07-24
• Weakness: CWE-287

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.

Affected products

• go-pkgz auth: from 1.18.0, < 1.25.2; from 2.0.0, < 2.1.2

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

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