CVE-2026-82754mediumCWE-424

CVE-2026-82754: fallo de gravedad media en ash-project ash_authentication_oauth2_server

ash_authentication_oauth2_server aliases every protocol endpoint under /.well-known, bypassing path-scoped controls

Publicada el · Actualizada el

Seguir esta CVE+ Monitorear ash authentication oauth2 server+ Monitorear ash_authentication_oauth2_server

Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

13Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 6.3epss 0.7%
Improper Protection of Alternate Path vulnerability in ash-project ash_authentication_oauth2_server exposes the state-changing OAuth endpoints under an unintended URL prefix, bypassing controls scoped to the canonical prefix. oauth2_server_protocol_routes/1 in AshAuthentication.Phoenix.Oauth2Server.Router forwards the same ProtocolRouter at both the /oauth prefix and the /.well-known prefix. Phoenix forward strips the matched prefix before dispatch, so the full route table answers under both mounts, and POST /register, POST /token, and POST /revoke are reachable as /.well-known/register, /.well-known/token, and /.well-known/revoke. Edge controls such as WAF rules, rate limits, or authentication exemptions written against the /oauth paths, or that allow-list /.well-known as unauthenticated, do not apply to the alias. This issue affects ash_authentication_oauth2_server: from 0.1.0 before 0.3.1.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Productos afectados
ash-project · ash_authentication_oauth2_server
CVEs relacionadas — ash-project ash_authentication_oauth2_server

En el mismo producto, de las más peligrosas a las menos.

CVE-2026-82758MEDIUMash_authentication_oauth2_server treats an empty resolved secret as valid, opening the gated Dynamic Client Registration endpointEPSS 0.7%CVE-2026-82756MEDIUMash_authentication_oauth2_server interpolates a tenant-derived value into the WWW-Authenticate challenge without escaping, allowing header parameter injectionEPSS 0.7%CVE-2026-82757MEDIUMash_authentication_oauth2_server CIMD fetcher classifies IPv4-in-IPv6 and site-local addresses as public, allowing SSRFEPSS 0.7%CVE-2026-82753HIGHUnauthenticated authorize requests create unbounded, never-expiring CIMD client rows and cache entries in ash_authentication_oauth2_serverEPSS 0.7%CVE-2026-82755MEDIUMash_authentication_oauth2_server serves tenant-specific OAuth metadata as publicly cacheable without Vary, enabling cross-tenant confusionEPSS 0.7%