CVE-2026-54603 | BDVDB-2026-353270 Detail

ruby-oauthoauth2

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

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

References#

Exploit#

No public exploit known

History#

Version 12026-07-28Record published in the CVE List.
Version 22026-10-05Most recent update recorded in the CVE List.

Published

Published: 2026-07-28
Last modified: 2026-10-05

Vendor information

Vendor: ruby-oauth
Product: oauth2

All ruby-oauth vulnerabilities

Score

8.6 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 39.2.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Information Disclosure

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 0.4.0, < 2.0.22
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

8.6 High

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

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

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).