Authenticated privilege escalation via case-insensitive identity matching
Published Sep 2, 2026 · Updated Sep 2, 2026
Access bypass in Drupal External Authentication before 2.0.13 allows remote authenticated users to gain another user's privileges. Authentication mappings store and look up externally supplied identity values without enforcing exact case matches, so case-insensitive database comparison can resolve a distinct identity to an existing mapping. Exploitation requires an affected MySQL or MariaDB collation for the mapping table and an external authentication path; the resulting session receives the privileges of the collided account.
Summary
What happened
Access bypass in Drupal External Authentication before 2.0.13 allows remote authenticated users to gain another user's privileges. Authentication mappings store and look up externally supplied identity values without enforcing exact case matches, so case-insensitive database comparison can resolve a distinct identity to an existing mapping. Exploitation requires an affected MySQL or MariaDB collation for the mapping table and an external authentication path; the resulting session receives the privileges of the collided account.
The record
- CVE
- CVE-2026-73476
- Published
- Sep 2, 2026
- Updated
- Sep 2, 2026
- Vendor
- OAuth.js
- Product
- External Authentication
- Classifications
- CWE-178, CAPEC-233, T1078
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 2, 2026CVE publishedPublication date reported by the CVE source.
- Sep 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.0.0 <2.0.13
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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