AIKIDO-2026-339127
drupal/externalauth is vulnerable to Access bypass
50
Medium Risk
This Affects:
drupal/externalauthTL;DR
The External Authentication Drupal module authenticates users against external identity providers. Affected versions do not sufficiently ensure exact matching of externally supplied identity values when storing and looking up authentication mappings under certain MySQL or MariaDB collation configurations. Distinct identities can therefore be treated as the same, enabling an access bypass. Exploitation is mitigated because it only affects sites using impacted MySQL or MariaDB collation settings for authentication mapping storage.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and store authentication mappings in MySQL or MariaDB with an impacted collation.
Background info
drupal/externalauth is vulnerable to Access bypass in versions 0.0.1 - 2.0.12.
How to fix this
Upgrade the drupal/externalauth library to the patch version.
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SOC 2Compliant
ISO 27001Compliant