PT-2026-54957 · Openid · Liboauth2

Marcin Wyczechowski + 1 · Publicado 2026-07-02 · Atualizado 2026-07-02 · CVE-2026-54430

NVD

CVSS v4.0

5.1

Média

Vetor base

AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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

Correção

SSRF

Enumeração de Fraquezas

CWE-918

Identificadores relacionados

CVE-2026-54430

Produtos afetados

Liboauth2

Referências · 5

• https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b · Nota
• https://github.com/OpenIDC/liboauth2 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-54430 · Nota de Segurança
• https://cert.pl/en/posts/2026/07/CVE-2026-54430 · Nota
• https://cert.pl/en/posts/2026/06/CVE-2026-54430 · Nota