Security Advisory

CVE-2026-54430

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-02 10:30:33

Last updated 2026-07-02 12:17:21

Assigner CERT-PL

CVSS score 5.1

State PUBLISHED

Description

liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB verifier reads both signer and kid from the unverified JWT header. If signer matches the configured ARN, kid is appended to alb_base_url without URL encoding or path sanitization, and the HTTP GET is issued before signature verification. This allows an attacker to force the server to send a GET request to an attacker-chosen internal path. This issue was fixed in version 2.3.0

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