Vulnerability · Published Sep 22, 2026 · Assigned by redhat
CVE-2026-90462Sssd: sssd: fail-open in ldap ppolicy access check allows continued authorization
Medium 5.4
In plain English
A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | sssd | no fix listed | DEBIAN-CVE-2026-90462 |
| Debian:13 | sssd | no fix listed | DEBIAN-CVE-2026-90462 |
| Ubuntu:22.04:LTS | sssd | no fix listed | UBUNTU-CVE-2026-90462 |
| Ubuntu:24.04:LTS | sssd | no fix listed | UBUNTU-CVE-2026-90462 |
| Ubuntu:26.04:LTS | sssd | no fix listed | UBUNTU-CVE-2026-90462 |
| Ubuntu:26.10 | sssd | no fix listed | UBUNTU-CVE-2026-90462 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
Weakness: CWE-280 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
References
- https://access.redhat.com/security/cve/CVE-2026-90462 vdb-entry, x_refsource_REDHAT
- RHBZ#2479483 issue-tracking, x_refsource_REDHAT