go-pkgz auth up to 1.25.1/2.1.1 improper authentication

Summaryinfo

A vulnerability identified as critical has been detected in go-pkgz auth up to 1.25.1/2.1.1. Affected is an unknown function. Performing a manipulation results in improper authentication. This vulnerability is reported as CVE-2026-42560. The attack requires a local approach. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in go-pkgz auth up to 1.25.1/2.1.1. It has been classified as critical. This affects some unknown functionality. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-42560 since 04/28/2026. The exploitability is told to be easy. Attacking locally is a requirement. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 1.25.2 or 2.1.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch c0b15ee72a8401da83c01781c16636c521f42698 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• go-pkgz

Name

• auth

Version

• 1.25.0
• 1.25.1
• 2.1.0
• 2.1.1

License

• open-source

Website

• Product: https://github.com/go-pkgz/auth/

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