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Full vulnerability report · 2026
CVE-2026-90462High confidence

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

Red Hat · Red Hat Enterprise Linux 10

5.4MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:High, raised one band.upgradedsince 22 Sep 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • EPSS is 0.18% for the current model date.

Compensating controls

  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Red Hat Red Hat Enterprise Linux 10 and falls inside the recorded affected range.
  2. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

4 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcesssdAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 9 Oct 2026
Debian bookwormbookworm · sourcesssdAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 9 Oct 2026
Debian sidsid · sourcesssdAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 9 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivesssdUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 8 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
CVE-2026-90462 · CSAF 2.0 · revision 2 · interimSUSE Product Security TeamCVE-2026-90462
938 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • libipa_hbac-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libipa_hbac0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_certmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_certmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_nss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_nss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_simpleifp-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_simpleifp0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • python3-sssd-config as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd as component of SUSE Linux Enterprise Desktop 15 SP7
Summary
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.
Remediation
No remediation text is recorded.
CVE-2026-90462 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysssd: SSSD: Fail-open in LDAP ppolicy access check allows continued authorization
166 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • 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
  • libsss_idmap as a component of Red Hat Enterprise Linux 10
  • libsss_nss_idmap as a component of Red Hat Enterprise Linux 10
  • libsss_nss_idmap-devel as a component of Red Hat Enterprise Linux 10
  • libsss_sudo as a component of Red Hat Enterprise Linux 10
  • python3-libipa_hbac as a component of Red Hat Enterprise Linux 10
  • python3-libsss_nss_idmap as a component of Red Hat Enterprise Linux 10
  • python3-sss as a component of Red Hat Enterprise Linux 10
  • python3-sss-murmur as a component of Red Hat Enterprise Linux 10
  • python3-sssdconfig as a component of Red Hat Enterprise Linux 10
Summary
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.
Remediation
There's no available mitigation for this issue.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-84537

No EUVD known-exploited evidence

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.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
5.4 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
01

What, why and how

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.

What

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.

Why

The product does not handle or incorrectly handles when it has insufficient privileges to access resources or functionality as specified by their permissions. This may cause it to follow unexpected code paths that may leave the product in an invalid state.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

The product does not handle or incorrectly handles when it has insufficient privileges to access resources or functionality as specified by their permissions. This may cause it to follow unexpected code paths that may leave the product in an invalid state.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Improper Handling of Insufficient Permissions or Privileges → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-280 ↗

CWE-280: Improper Handling of Insufficient Permissions or Privileges. The product does not handle or incorrectly handles when it has insufficient privileges to access resources or functionality as specified by their permissions. This may cause it to follow unexpected code paths that may leave the product in an invalid state.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-280Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-84537Official EUVD mapping

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.

Official EUVD record ↗
JVN iPedia · Japanese · JVNDB-2026-037080Fedora Project等の複数ベンダの製品における不十分なパーミッションまたは特権の不適切な処理に関する脆弱性

SSSDに脆弱性が発見されました。LDAPアクセスプロバイダーを使用し、かつ`ldap_access_order`に`ppolicy`または`lockout`が含まれている設定の場合、ユーザー検索が結果を返さないときにLDAPのppolicyアクセスチェックでフェイルオープン状態が発生することがあります。これにより誤って成功が返され、許可決定がキャッシュされてしまい、削除または廃止されたユーザーに対する継続的な認可が許可されてしまいます。既存の有効なアカウントコンテキストを持つリモートの攻撃者は、この脆弱性を悪用して情報へのアクセスを維持し、本来利用できなくなっているリソースに対して限定的な変更を加える可能性があります。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix not verified
Affected
  • libipa_hbac-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libipa_hbac0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_certmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_certmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_nss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_nss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_simpleifp-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libsss_simpleifp0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • python3-sssd-config as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-32bit as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-ad as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-dbus as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-ipa as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-kcm as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-krb5 as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-krb5-common as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-ldap as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-proxy as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-tools as component of SUSE Linux Enterprise Desktop 15 SP7
  • sssd-winbind-idmap as component of SUSE Linux Enterprise Desktop 15 SP7
  • libipa_hbac-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libipa_hbac0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_certmap0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_idmap-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_idmap0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_nss_idmap-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libsss_nss_idmap0 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • and 908 more
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 22 Sept 2026 · Last source change 22 Sept 2026, 17:25 UTC · CWE-280 · Improper Handling of Insufficient Permissions or Privileges

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-23
European sourceENISA EUVD · EUVD-2026-84537
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. ENISA EUVD mappingEUVD-2026-84537 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-84537"}
    ENISA EUVD ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: access.redhat.com/CVE-2026-90462; added vendor advisory: bugzilla.redhat.com/show_bug.cgi?id=2479483.
    Before
    no authoritative guidance recorded
    After
    vendor advisory: access.redhat.com/CVE-2026-90462 · vendor advisory: bugzilla.redhat.com/show_bug.cgi?id=2479483
    secalert@redhat.com ↗
  3. Public exploit evidencePublic exploit evidence changed from Public exploit reference to Public exploit reference.
    Before
    Public exploit reference
    After
    Public exploit reference
    bugzilla.redhat.com ↗
  4. Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.
    Before
    No public exploit
    After
    Public exploit reference
    CVE.org ↗
  5. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-84537↗Vendor CSAF · SUSE Product Security Team↗CISA Vulnrichment SSVC evidence↗CVE authority or vendor reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-90462 · cve.blacktree.nl