CVE-2026-54603

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.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/ruby-oauth/oauth2/commit/0f0a474f1b38453e119e660c2daca742d4378ce9
https://github.com/ruby-oauth/oauth2/releases/tag/v2.0.22
https://github.com/ruby-oauth/oauth2/security/advisories/GHSA-pp92-crg2-gfv9
https://github.com/ruby-oauth/oauth2/security/advisories/GHSA-pp92-crg2-gfv9

Configurations

No configuration.

History

No history.

Information

Published : 2026-07-28 17:16

Updated : 2026-09-09 20:50

NVD link : CVE-2026-54603

Mitre link : CVE-2026-54603

CVE.ORG link : CVE-2026-54603

JSON object : View

Products Affected

No product.

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

CWE-601

URL Redirection to Untrusted Site ('Open Redirect')

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