CVE-2026-54603 | OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authoriza… | CVSS 8.6 HIGH

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.

Metadata

CVE ID: CVE-2026-54603
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-15 19:45 UTC
Published: 2026-07-28 16:29 UTC
Last updated: 2026-07-28 16:29 UTC
Primary CWE: CWE-200
CWE-200: Exposure of Sensitive Information to an Unauthorize…
Vendor / Product: ruby-oauth / oauth2
Sources: cve.org · NVD

Severity & Metrics

8.6 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products (1)

Vendor	Product	Platform	Versions
ruby-oauth	oauth2	—	>= 0.4.0, < 2.0.22

Weakness (CWE)

CWE	Source	Description
CWE-200	cna	CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-601	cna	CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.6	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References (3)

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