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Public proof of conceptFix available

CVE-2026-90462

Sssd: sssd: fail-open in ldap ppolicy access check allows continued authorization

A public proof of concept exists; no exploitation attested.

  • Published2026-09-22
  • WeaknessCWE-280

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-09-2215:50CVE publishedCNA

Versions per branch

NVD
Redhat enterprise linux
BranchAffectedFixed in
7.0= 7.0no fix published
8.0= 8.0no fix published
9.0= 9.0no fix published
10.0= 10.0no fix published
Fedoraproject sssd
BranchAffectedFixed in
2.12= 2.12.0no fix published
Redhat openshift container platform
BranchAffectedFixed in
4.0= 4.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA8 products

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

2 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-06

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • sssdUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • sssdUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • sssdUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • sssdUbuntu:26.10all versions · no fixed version listed
  • sssdUbuntu:26.04:LTSall versions · no fixed version listed
  • sssdUbuntu:24.04:LTSall versions · no fixed version listed
  • sssdUbuntu:22.04:LTSall versions · no fixed version listed
  • sssdTuxCare:AlmaLinux:9.6all versions · fixed in 2.9.6-4.el9_6.2.tuxcare.els8and 34 other packages

6 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-90462 Red Hat Product Security166 known affected

    sssd: SSSD: Fail-open in LDAP ppolicy access check allows continued authorization

    libipa_hbac as a component of Red Hat Enterprise Linux 10 · libsss_autofs as a component of Red Hat Enterprise Linux 10 · libsss_certmap as a component of Red Hat Enterprise Linux 10 · +163 more

Full record on NVD

Fix

  1. Workaround from the vendor Red Hat Product Security CVE-2026-90462 · 166 productsThere's no available mitigation for this issue.
  2. No fix available, says the vendor Red Hat Product Security CVE-2026-90462 · 135 productsFix deferred
  3. No fix planned, says the vendor Red Hat Product Security CVE-2026-90462 · 31 productsOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Published
2026-09-22
Last Modified
2026-11-06
NVD status
Analyzed
GitHub Advisory
GHSA-58vh-w7mf-682f

Frequently asked questions

What is CVE-2026-90462?

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.

Is CVE-2026-90462 actively exploited?

A proof-of-concept exploit exists for CVE-2026-90462, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-90462?

CVE-2026-90462 has a CVSS v3 base score of 5.4 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

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Sources for this record