CVE-2026-81509
nforwardauth is a forward auth service that allows the use of a single authentication middleware for multiple sites. Versions prior to 1.5.1
CVSS
6.1
Medio
EPSS
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KEV
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Exploit Today
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0-100
Publicado: 26 oct 2026 · Última mod.: 26 oct 2026 · CWE-601
Sin historial EPSS suficiente todavía.
nforwardauth is a forward auth service that allows the use of a single authentication middleware for multiple sites. Versions prior to 1.5.1 accept an unvalidated `r` query parameter on the `/login` endpoint and use them as the post-authentication redirect destination. An unauthenticated attacker can create a legitimate `nforwardauth` login URL that redirects a victim to an attacker-controlled website after the victim successfully authenticates. This issue may facilitate phishing and other social-engineering attacks by abusing the trust associated with the legitimate authentication domain. This vulnerability does not provide an unauthenticated ForwardAuth bypass. Version 1.5.1 contains a patch.
- github.comhttps://github.com/nosduco/nforwardauth/commit/664f2602f9e1459558d1c4c55019f6d48bc64c43
- github.comhttps://github.com/nosduco/nforwardauth/pull/71
- github.comhttps://github.com/nosduco/nforwardauth/releases/tag/v1.5.1
- github.comhttps://github.com/nosduco/nforwardauth/security/advisories/GHSA-q64r-v7j5-6hfg
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