VULNERABILITY INTELLIGENCE
CVE-2026-54430
CVSS score5.1 MEDIUM
EPSS probability0.17%
CISA KEVNot currently listed
Published2026-07-02
Last modified2026-10-25
CVSS vectorCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N
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
Weakness classification
- CWE-918: Server-Side Request Forgery (SSRF)