Vulnerabilities CVE-2026-54603

CVE-2026-54603

High

Open

TLP:CLEAR

OAuth2::Client#request: Protocol-relative redirect Location overrides authority, leaking bearer Authorization to attacker host

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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.

Details

CVSS Score: 8.6
EPSS Score ⓘ: 0.27%

18.7th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Confidence: 90%
Published: Jul 28, 2026
Last Modified: Jul 28, 2026

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