CVE-2026-42560 (GCVE-0-2026-42560)
Vulnerability from cvelistv5 – Published: 2026-05-09 04:15 – Updated: 2026-05-11 17:31
VLAI
EPSS
VEX
Title
auth: Patreon provider assigns the same local user ID to every authenticated Patreon account, enabling cross‑user impersonation
Summary
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.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 17:31 UTC
CWE
- CWE-287 - Improper Authentication
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/go-pkgz/auth/security/advisori… | x_refsource_CONFIRM |
| https://github.com/go-pkgz/auth/commit/c0b15ee72a… | x_refsource_MISC |
| https://github.com/go-pkgz/auth/releases/tag/v1.25.2 | x_refsource_MISC |
| https://github.com/go-pkgz/auth/releases/tag/v2.1.2 | x_refsource_MISC |
Impacted products
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"id": "CVE-2026-42560",
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"Technical Impact": "partial"
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"role": "CISA Coordinator",
"timestamp": "2026-05-11T17:31:25.710343Z",
"version": "2.0.3"
},
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"providerMetadata": {
"dateUpdated": "2026-05-11T17:31:32.968Z",
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"url": "https://github.com/go-pkgz/auth/security/advisories/GHSA-f6qq-3m3h-4g42"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "auth",
"vendor": "go-pkgz",
"versions": [
{
"status": "affected",
"version": "\u003e= 1.18.0, \u003c 1.25.2"
},
{
"status": "affected",
"version": "\u003e= 2.0.0, \u003c 2.1.2"
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}
],
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"discovery": "UNKNOWN"
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"title": "auth: Patreon provider assigns the same local user ID to every authenticated Patreon account, enabling cross\u2011user impersonation"
}
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}
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"title": "auth: Patreon provider assigns the same local user ID to every authenticated Patreon account, enabling cross\u2011user impersonation"
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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