# CVE-2026-104033: Sssd: sssd: access control bypass via improper ldap shadow expiration check

Status: published. Published: 2026-10-06. Updated: 2026-11-05.

A flaw was found in SSSD. When configured to enforce account expiration using LDAP (Lightweight Directory Access Protocol) shadow attributes, SSSD fails to treat an expiration value of zero as an expired account. A user with valid credentials for an expired account can exploit this flaw to bypass access controls and authenticate to the system. This allows unauthorized access to persist after the account was intended to be deactivated.

## Remediation

- workaround: Until a fix is available, deployments using SSSD's LDAP shadow-based expiration (access_provider = ldap with ldap_access_order including expire and ldap_account_expire_policy = shadow) should not rely on shadowExpire=0 to expire accounts. Set the shadowExpire attribute to a positive past day value so that SSSD correctly treats the account as expired, or enforce account disablement or expiration through directory-side controls that do not depend solely on this client-side SSSD check. If SSSD has cached the affected account's attributes, invalidate the cached entry (for example with sss_cache -u <username>) or restart the sssd service so the updated directory values take effect; note that restarting the service or clearing cached data can briefly interrupt active authentication sessions on the host. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 5 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N; source: CNA: redhat

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.24% as of 2026-11-05; percentile 14.59%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-193

## Exploit evidence

- exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2479271 (ADP: CISA-ADP)

## References

- https://access.redhat.com/security/cve/CVE-2026-104033 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479271 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479271 (ADP: CISA-ADP; exploit)

- https://access.redhat.com/security/cve/CVE-2026-104033 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479271 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479271 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-104033; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104033; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-104033; retrieved 2026-11-05; source updated Not reported

Revision: 247b28360a908f94222453018f745db8beee77aab0000eb818b9067432c884d2

Canonical: https://y2.dev/cve/CVE-2026-104033

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