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

CVSS 9.1 · Critical EPSS 0.07% · P21
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I. Basic Information for CVE-2026-42560

Vulnerability Information
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Vulnerability Title
auth: Patreon provider assigns the same local user ID to every authenticated Patreon account, enabling cross‑user impersonation
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
go-pkgzauth >= 1.18.0, < 1.25.2 -

II. Public POCs for CVE-2026-42560

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III. Intelligence Information for CVE-2026-42560

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IV. Related Vulnerabilities

Same product: auth
Same weakness: CWE-287

V. Comments for CVE-2026-42560

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