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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54603
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-28 17:16:52 UTC
Updated2026-07-29 14:16:31 UTC
DescriptionOAuth2 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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

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

EPSS: 0.002680000 probability, percentile 0.188110000 (date 2026-07-30)

Problem Types: CWE-200 | CWE-601 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-601 CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ruby-oauth Oauth2 affected >= 0.4.0, < 2.0.22 Not specified

References

ReferenceSourceLinkTags
github.com/ruby-oauth/oauth2/security/advisories/GHSA-pp92-crg2-gfv9 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/ruby-oauth/oauth2/commit/0f0a474f1b38453e119e660c2daca742d437... [email protected] github.com
github.com/ruby-oauth/oauth2/releases/tag/v2.0.22 [email protected] github.com
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