CVE-2026-114618mediumCWE-1188CWE-287

CVE-2026-114618: fallo de gravedad media en authlib

Authlib: Default JWT bearer grant accepts assertions for the wrong audience

Publicada el · Actualizada el

Seguir esta CVE+ Monitorear authlib+ Monitorear python-authlib

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 6.8epss 0.4%
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, the default RFC 7523 JWTBearerGrant.get_audiences() returns an empty list, causing JWTBearerGrant.verify_claims() to require only that an aud claim exists without matching the current authorization server. An attacker holding a legitimate assertion for another service can present it to a server that shares the signing key and uses the default grant, obtaining an access token across a trust boundary. Implementations that override get_audiences() with the server's valid audience identifiers are not affected. This issue is fixed in version 1.9.0.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Productos afectados
authlib · authlib
CVEs relacionadas — authlib

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

CVE-2025-61920HIGHAuthlib is vulnerable to Denial of Service via Oversized JOSE SegmentsEPSS 0.6%CVE-2026-27962CRITICALAuthlib JWS JWK Header Injection: Signature Verification BypassEPSS 0.6%CVE-2026-28802HIGHAuthlib: Setting `alg: none` and a blank signature appears to bypass signature verificationEPSS 0.5%CVE-2025-62706MEDIUMAuthlib : JWE zip=DEF decompression bomb enables DoSEPSS 0.5%CVE-2026-114620MEDIUMAuthlib: Unvalidated request_uri fetch in JWT-secured authorization request (JAR) leading to SSRFEPSS 0.4%CVE-2026-114616HIGHAuthlib accepts an empty HMAC key, allowing JWS/JWT signature forgery (HS256/HS384/HS512)EPSS 0.3%