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PatchSiren cyber security CVE debrief

CVE-2026-5343 Drupal CVE debrief

A privilege escalation vulnerability exists in the Drupal SAML SSO - Service Provider module. The flaw stems from an improper check for unusual or exceptional conditions (CWE-754), allowing attackers to escalate privileges. Affected versions span from 0.0.0 through 3.1.3; version 3.1.4 contains the fix. The vulnerability was disclosed via official Drupal security advisory SA-CONTRIB-2026-031 on 2026-05-28. No known exploitation in ransomware campaigns has been reported, and the issue has not been added to CISA's Known Exploited Vulnerabilities catalog.

Vendor
Drupal
Product
SAML SSO - Service Provider
CVSS
HIGH 7.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-28
Original CVE updated
2026-07-21
Advisory published
2026-05-28
Advisory updated
2026-07-21

Who should care

Organizations running Drupal with SAML SSO - Service Provider module versions prior to 3.1.4, particularly those using SAML-based federated authentication for administrative or privileged user access. Security teams responsible for identity and access management infrastructure, Drupal site administrators, and compliance officers monitoring authentication control effectiveness.

Technical summary

The SAML SSO - Service Provider module for Drupal fails to properly validate exceptional conditions during SAML authentication processing. This improper check (CWE-754) can be exploited to escalate privileges beyond those intended for the authenticated user. The vulnerability affects all versions from initial release (0.0.0) through 3.1.3. The fix in version 3.1.4 adds proper validation of edge cases and exceptional conditions during the SAML assertion handling workflow. Organizations using this module for federated authentication should prioritize patching due to the direct impact on access control boundaries.

Defensive priority

high

Recommended defensive actions

  • Upgrade Drupal SAML SSO - Service Provider module to version 3.1.4 or later
  • Review user privilege assignments for unexpected administrative access
  • Monitor authentication logs for anomalous SAML assertion processing
  • Apply principle of least privilege to SAML-authenticated accounts
  • Verify SAML identity provider configuration integrity

Evidence notes

Official CVE record published 2026-05-28. Drupal security advisory SA-CONTRIB-2026-031 confirms affected versions and fix version. CWE-754 classification provided by NVD. No CVSS score or severity assigned at time of publication.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-5343 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-5343

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-5343 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-5343

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.