CVE-2026-104988 Auth bypass in Red Hat Certificate System 10
An authenticated EST user can bypass authentication checks to obtain CA-signed certificates with arbitrary subject names due to a failure in the CMCAuthForEST plugin.
- 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-2026-104988?
CVE-2026-104988 is a high-severity authentication bypass vulnerability in Red Hat Certificate System 10, published on 2 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in Dogtag PKI (pki-core). The CMCAuthForEST authentication plugin fails open when an EST fullcmc enrollment request is submitted via BasicAuth without an end-user TLS client certificate. The SSL_CLIENT_CERT session attribute retains the EST subsystem's agent certificate, which causes downstream authorization checks to treat the request as agent-privileged. An authenticated EST user can exploit this to obtain CA-signed certificates with arbitrary subject names.
Weakness: CWE-290
Which versions are affected by CVE-2026-104988?
How do I fix CVE-2026-104988?
No fix has been published for CVE-2026-104988 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-2026-104988 being exploited?
There is no known exploitation of CVE-2026-104988 in the wild and no public exploit code.
Sources
Also known as GHSA-qgmm-v3v3-wff2, UBUNTU-CVE-2026-104988.