PoC Index83,593 CVEs with PoCs

CVE-2026-114620

Authlib: Unvalidated request_uri fetch in JWT-secured authorization request (JAR) leading to SSRF

MEDIUM 5.4EPSS 0.4%

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, Authlib's RFC 9101 JWTAuthenticationRequest passes the unauthenticated, client-controlled request_uri parameter to the abstract get_request_object() hook before applying a destination or registration policy; the hook itself performs no network request, while the documentation demonstrates an unrestricted HTTP fetch. In deployments whose integrator implements that hook as an unrestricted outbound fetch, a remote attacker who knows a valid public client identifier can make the authorization server request internal, link-local, or otherwise unintended URLs and can distinguish fetch outcomes through different error responses and timing. Deployments whose custom hook already applies a secure allowlist, destination controls, and retrieval limits are not affected. The JWTAuthenticationRequest implementation in authlib/oauth2/rfc9101/authorization_server.py forwards request_uri to get_request_object() before an application-approved retrieval policy accepts the destination. This issue is fixed in version 1.9.0.

Affected
authlib
CVSS v3.1 GITHUB
5.4 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
EPSS
0.39% chance of exploitation in the next 30 days, 33rd percentile
Published
2026-10-22
Updated
2026-10-30

Proof-of-concept exploits (1)

CVE references

References