Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-54430

Severity CVSS v4.0:
MEDIUM
Type:
CWE-918 Server-Side Request Forgery (SSRF)
Publication date:
02/07/2026
Last modified:
02/07/2026

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<br /> header. If signer matches the configured ARN, kid is appended to<br /> alb_base_url without URL encoding or path sanitization, and the HTTP GET<br /> is issued before signature verification. This allows an attacker to force<br /> the server to send a GET request to an attacker-chosen internal path.<br /> <br /> This issue was fixed in version 2.3.0

Impact

Vector 4.0
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N CVSS v4.0 Severity and Metrics:

Base Score: 5.10 MEDIUM
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N

Attack Vector (AV): Local
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): Low
Availability (VA): None
Confidentiality (SC): Low
Integrity (SI): None
Availability (SA): None

Base Score 4.0
5.10
Severity 4.0
MEDIUM

References to Advisories, Solutions, and Tools