CVE-2026-54603

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CVSS 3.1

8.6 high

EPSS

<1%p37

Published

Jul 28, 2026 (Jul 28, 2026)

Modified

Sep 9, 2026

Description

OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect (OIDC). From 0.4.0 to 2.0.21, a protocol-relative redirect Location returned to OAuth2::Client#request overrides the request authority, so the bearer Authorization header is sent to an attacker-controlled host, leaking the credential. This issue is fixed in version 2.0.22.

Weakness: CWE-200, CWE-601
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

NVD CVE.org GitHub PoCs EPSS (0.4%)

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