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

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Summary

CVECVE-2026-42560
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-09 06:16:10 UTC
Updated2026-05-09 06:16:10 UTC
Descriptionauth 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

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

Problem Types: CWE-287 | CWE-287 CWE-287: Improper Authentication

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go-pkgz Auth affected >= 1.18.0, < 1.25.2 Not specified
CNA Go-pkgz Auth affected >= 2.0.0, < 2.1.2 Not specified

References

ReferenceSourceLinkTags
github.com/go-pkgz/auth/security/advisories/GHSA-f6qq-3m3h-4g42 [email protected] github.com
github.com/go-pkgz/auth/releases/tag/v2.1.2 [email protected] github.com
github.com/go-pkgz/auth/releases/tag/v1.25.2 [email protected] github.com
github.com/go-pkgz/auth/commit/c0b15ee72a8401da83c01781c16636c521f42698 [email protected] github.com
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