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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… (CVE-2026-90462)

0
Medium
VulnerabilityCVE-2026-90462gcveosvubuntu-cve-2026-90462cve-2026-90462ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-26-04-lts
Published: 09/22/2026 (09/22/2026, 16:18:00 UTC)
Source: GCVE Database
Product: sssd

Description

A vulnerability in SSSD occurs when configured with the LDAP access provider and ldap_access_order including ppolicy or lockout. If a user lookup returns zero results, a fail-open condition in the LDAP ppolicy access check can cause an incorrect success response and cache an allow decision. This permits continued authorization for deleted or deprovisioned users. A remote attacker with prior valid account context could exploit this to maintain access and potentially make limited modifications to resources no longer authorized.

CVSS v3.1

Score 5.4medium

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
sssd
pkg:deb/ubuntu/sssd?arch=source&distro=esm-infra-legacy/xenial
Affected versions
=1.12.5-2=1.13.1-2=1.13.2-1=1.13.3-1=1.13.4-1=1.13.4-1ubuntu1=1.13.4-1ubuntu1.1=1.13.4-1ubuntu1.2=1.13.4-1ubuntu1.5=1.13.4-1ubuntu1.6=1.13.4-1ubuntu1.7=1.13.4-1ubuntu1.8=1.13.4-1ubuntu1.9=1.13.4-1ubuntu1.10=1.13.4-1ubuntu1.11=1.13.4-1ubuntu1.12=1.13.4-1ubuntu1.13=1.13.4-1ubuntu1.14=1.13.4-1ubuntu1.15=1.13.4-1ubuntu1.15+esm1
Ubuntu:Pro:18.04:LTSmore threats →ghsa
sssd
pkg:deb/ubuntu/sssd?arch=source&distro=esm-infra/bionic
Affected versions
=1.15.3-2ubuntu1=1.15.3-3ubuntu1=1.16.0-5ubuntu1=1.16.0-5ubuntu2=1.16.1-1ubuntu1=1.16.1-1ubuntu1.1=1.16.1-1ubuntu1.2=1.16.1-1ubuntu1.3=1.16.1-1ubuntu1.4=1.16.1-1ubuntu1.5=1.16.1-1ubuntu1.6=1.16.1-1ubuntu1.7=1.16.1-1ubuntu1.8=1.16.1-1ubuntu1.8+esm1
Ubuntu:Pro:20.04:LTSmore threats →ghsa
sssd
pkg:deb/ubuntu/sssd?arch=source&distro=esm-infra/focal
Affected versions
=2.2.0-4ubuntu1=2.2.2-1=2.2.2-1ubuntu1=2.2.3-1.1ubuntu1=2.2.3-2=2.2.3-3=2.2.3-3ubuntu0.1=2.2.3-3ubuntu0.2=2.2.3-3ubuntu0.3=2.2.3-3ubuntu0.4=2.2.3-3ubuntu0.6=2.2.3-3ubuntu0.7=2.2.3-3ubuntu0.8=2.2.3-3ubuntu0.9=2.2.3-3ubuntu0.10=2.2.3-3ubuntu0.11=2.2.3-3ubuntu0.12=2.2.3-3ubuntu0.13=2.2.3-3ubuntu0.13+esm1
Ubuntu:22.04:LTSmore threats →ghsa
sssd
pkg:deb/ubuntu/sssd?arch=source&distro=jammy
Affected versions
=2.4.1-2ubuntu4=2.5.2-4ubuntu1=2.5.2-4ubuntu3=2.5.2-4ubuntu4=2.6.1-1ubuntu3=2.6.3-1ubuntu3=2.6.3-1ubuntu3.1=2.6.3-1ubuntu3.2=2.6.3-1ubuntu3.3=2.6.3-1ubuntu3.4=2.6.3-1ubuntu3.5=2.6.3-1ubuntu3.6=2.6.3-1ubuntu3.8=2.6.3-1ubuntu3.9
Ubuntu:24.04:LTSmore threats →ghsa
sssd
pkg:deb/ubuntu/sssd?arch=source&distro=noble
Affected versions
=2.9.1-2ubuntu2=2.9.1-2ubuntu3=2.9.2-1ubuntu2=2.9.4-1ubuntu1=2.9.4-1.1ubuntu3=2.9.4-1.1ubuntu5=2.9.4-1.1ubuntu6=2.9.4-1.1ubuntu6.1=2.9.4-1.1ubuntu6.2=2.9.4-1.1ubuntu6.3=2.9.4-1.1ubuntu6.4=2.9.4-1.1ubuntu6.5=2.9.4-1.1ubuntu6.6=2.9.4-1.1ubuntu6.7=2.9.4-1.1ubuntu6.8
Ubuntu:26.04:LTSmore threats →ghsa
sssd
pkg:deb/ubuntu/sssd?arch=source&distro=resolute
Affected versions
=2.10.1-2ubuntu5=2.10.1-2ubuntu7=2.12.0-1ubuntu3=2.12.0-1ubuntu4=2.12.0-1ubuntu5=2.12.0-1ubuntu5.1=2.12.0-1ubuntu5.2=2.12.0-1ubuntu5.3=2.12.0-1ubuntu5.4=2.12.0-1ubuntu5.5

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/08/2026, 22:38:28 UTC

Technical Analysis

CVE-2026-90462 describes a flaw in SSSD's LDAP access provider configuration when ldap_access_order includes ppolicy or lockout. If a user lookup returns zero results, the LDAP ppolicy access check may fail open, incorrectly returning success and caching an allow decision. This flaw allows a remote attacker who previously had valid account context to maintain access to information and potentially perform limited modifications to resources that should have been revoked due to user deletion or deprovisioning.

Potential Impact

The vulnerability allows unauthorized continued access for deleted or deprovisioned users due to a fail-open condition in LDAP ppolicy access checks. This could enable a remote attacker with prior valid credentials to maintain access and potentially make limited unauthorized changes to protected resources.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-90462
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ac80fe22cdf04f65639c86e

Added to database: 10/08/2026, 21:49:22 UTC

Last enriched: 10/08/2026, 22:38:28 UTC

Last updated: 10/08/2026, 22:38:28 UTC

Views: 6

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