VULNERABILITY INTELLIGENCE
CVE-2026-54603
CVSS score8.6 HIGH
EPSS probability0.45%
CISA KEVNot currently listed
Published2026-07-28
Last modified2026-10-23
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
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 classification
- security-advisories@github.com: CWE-200