CVE-2026-49332 Auth bypass in Red Hat OpenShift Container Platform 4.12
Attackers can impersonate other users by smuggling underscore-variant headers, bypassing authentication in OpenShift OAuth Proxy deployments.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49332?
CVE-2026-49332 is a high-severity authentication bypass vulnerability in Red Hat OpenShift Container Platform 4.12, published on 28 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in openshift/oauth-proxy. The proxy sets authenticated identity headers using only dash-variant keys (X-Forwarded-User) but does not strip underscore-variant keys (X_Forwarded_User) from incoming requests. WSGI and PHP frameworks normalize both variants to the same variable, allowing an authenticated low-privilege user to smuggle a forged identity that may override the legitimate authenticated identity in the upstream application.
Weakness: CWE-436
Which versions are affected by CVE-2026-49332?
How do I fix CVE-2026-49332?
No fix has been published for CVE-2026-49332 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-49332 being exploited?
There is no known exploitation of CVE-2026-49332 in the wild and no public exploit code.
Sources
Also known as GHSA-f2m2-cc3f-h4j2.