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CVE-2026-73476 Drupal CVE debrief

A CVE record for Improper Handling of Case Sensitivity vulnerability in Drupal External Authentication allows Privilege Escalation was published on 2026-09-02T13:18:08.413Z and last modified on 2026-09-15T12:28:25.280Z. The NVD entry is currently Analyzed. This medium-severity vulnerability affects Drupal External Authentication versions from 0.0.0 to 2.0.13, potentially allowing privilege escalation. Drupal administrators and security teams should assess exposure and prioritize verification of their installations. The CVE record and NVD detail page provide information on the vulnerability, but vendor advisory details are limited.

Vendor
Drupal
Product
External Authentication
CVSS
MEDIUM 5.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-02
Original CVE updated
2026-09-15
Advisory published
2026-09-02
Advisory updated
2026-09-15

Who should care

Drupal administrators and security teams should assess exposure and prioritize verification of their installations using External Authentication versions from 0.0.0 to 2.0.13.

Why it matters

CVE-2026-73476 is a medium-severity vulnerability in Drupal External Authentication that allows for privilege escalation. Defenders should verify exposure, assess remediation needs, and prioritize updates or compensating controls.

  • Verification of exposure in Drupal installations using External Authentication versions from 0.0.0 to 2.0.13 is required to prevent potential privilege escalation.
  • Defenders should assess the need for updates or compensating controls to mitigate the vulnerability.
  • Remediation priority is medium due to the CVSS score of 5.4 and the potential for privilege escalation.

Technical summary

The External Authentication module for Drupal is vulnerable to improper handling of case sensitivity, potentially allowing for privilege escalation. The issue affects External Authentication versions from 0.0.0 to 2.0.13. This vulnerability has a CVSS score of 5.4 and is considered medium-severity. Defenders should verify exposure in their Drupal installations using External Authentication versions from 0.0.0 to 2.0.13 and assess the need for updates or compensating controls.

Defensive priority

Defenders should prioritize verifying exposure in their Drupal installations using External Authentication versions from 0.0.0 to 2.0.13 and assess the need for updates or compensating controls.

Recommended defensive actions

  • Verify Drupal External Authentication version and check for updates to version 2.0.14 or later
  • Assess exposure in Drupal installations using External Authentication versions from 0.0.0 to 2.0.13
  • Consider implementing compensating controls for privilege escalation vulnerabilities

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, but vendor advisory details are limited. Further verification of affected versions and remediation steps is required.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-73476 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-73476

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

  • CVE-2026-73476 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-73476

    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.