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DRUPAL-CONTRIB-2025-043unknown

Block Class enables you to add custom attributes to blocks.

Impact

Block Class enables you to add custom attributes to blocks.

Source excerpt · OSV
Applies when

This vulnerability is mitigated by the fact that an attacker must have a role with the permission "administer block classes".

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

drupal/block_class Packagist:https://packages.drupal.org/8
Affected rangeRecorded fix
From 4.0.0 before 4.0.1Ecosystem versions4.0.1

Version evidence: OSV · DRUPAL-CONTRIB-2025-043

View original version evidence (0 explicit versions)

Original source description

Block Class enables you to add custom attributes to blocks.

The module did not sufficiently sanitize custom attribute input, allowing for potential XSS attacks when malicious JavaScript was injected as a custom attribute.

This vulnerability is mitigated by the fact that an attacker must have a role with the permission "administer block classes".

References