CVE-2026-42560— auth: Patreon provider assigns the same local user ID to every authenticated Patreon account, enabling cross‑user impersonation
Possible ATT&CK Techniques 3AI
T1136 · Create Account T1098.004 · SSH Authorized Keys T1136.001 · Local AccountGet alerts for future matching vulnerabilitiesLog in to subscribe
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)
Vulnerability Title
Auth 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Auth是Supabase开源的一个用户认证与管理系统。 Auth 1.18.0版本至1.25.2之前版本和2.0.0版本至2.1.2之前版本存在授权问题漏洞，该漏洞源于Patreon OAuth提供程序将所有经过身份验证的Patreon账户映射到同一个本地用户ID，可能导致跨账户访问、权限混淆和订阅状态泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-42560
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Vendor · 2Advisory · 1Patch · 1
- Release Version 2.1.2 · go-pkgz/auth · GitHubx_refsource_MISC
- Release Version 1.25.2 · go-pkgz/auth · GitHubx_refsource_MISC
- Merge commit from fork · go-pkgz/auth@c0b15ee · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-42560
IV. Related Vulnerabilities
Same weakness: CWE-287
- CVE-2026-44058
Authentication bypass via admin auth user - CVE-2026-40165
authentik: SAML NameID XML Comment Injection Enables Authent - CVE-2026-2812
Improper Authentication issue in ArcGIS Server - CVE-2026-9084
MISP OIDC authentication bypass via automatic email-based ac - CVE-2026-6456
Account Switcher <= 1.0.2 - Authenticated (Subscriber+) Auth
V. Comments for CVE-2026-42560
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