Incorrect Behavior Order: Authorization Before Parsing and Canonicalization Affecting rhceph/oauth2-proxy-rhel9 package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.21% (11th percentile)

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  • Snyk IDSNYK-RHEL8-RHCEPHOAUTH2PROXYRHEL9-16808496
  • published23 May 2026
  • disclosed21 Apr 2026

Introduced: 21 Apr 2026

CVE-2026-40574  (opens in a new tab)
CWE-551  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 rhceph/oauth2-proxy-rhel9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rhceph/oauth2-proxy-rhel9 package and not the rhceph/oauth2-proxy-rhel9 package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Prior to 7.15.2, an authorization bypass exists in OAuth2 Proxy as part of the email_domain enforcement option. An attacker may be able to authenticate with an email claim such as attacker@evil.com@company.com and satisfy an allowed domain check for company.com, even though the claim is not a valid email address. The issue ONLY affects deployments that rely on email_domain restrictions and accept email claim values from identity providers or claim mappings that do not strictly enforce normal email syntax. This vulnerability is fixed in 7.15.2.

CVSS Base Scores

version 3.1