CVE-2026-82754mediumCWE-424

CVE-2026-82754: falha de média gravidade em ash-project ash_authentication_oauth2_server

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

Publicada em · Atualizada em

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

Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.

13Vexday Risk Score

Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.

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
Produtos afetados
ash-project · ash_authentication_oauth2_server
CVEs relacionadas — ash-project ash_authentication_oauth2_server

No mesmo produto, das mais perigosas para as 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%