CVE-2026-90462 Sssd: sssd: fail-open in ldap ppolicy access check allows continued authorization
A fail-open flaw in SSSD's LDAP ppolicy check allows deleted users to retain access, enabling unauthorized data access and limited modifications.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90462?
CVE-2026-90462 is a medium-severity authentication bypass vulnerability in Redhat Enterprise Linux, published on 22 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in SSSD. When configured with the LDAP access provider and `ldap_access_order` including `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup returns zero results. This can incorrectly return success and cache an allow decision, permitting continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account context could exploit this to maintain access to information and potentially make limited modifications to resources that should no longer be available.
Weakness: CWE-280
Which versions are affected by CVE-2026-90462?
It affects 3 products.
Products include Fedoraproject Sssd, Redhat Enterprise Linux, Redhat Openshift Container Platform.
How do I fix CVE-2026-90462?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-90462 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90462 exists.
Other vulnerabilities in Redhat Enterprise Linux
Sources
Also known as DEBIAN-CVE-2026-90462, GHSA-58vh-w7mf-682f, UBUNTU-CVE-2026-90462.