drupal/block_class - SA-CONTRIB-2025-043
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".
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | drupal/block_class | >= 4.0.0, < 4.0.1 | 4.0.1 |
| Drupal module | drupal/block_class | >= 4.0.0, < 4.0.1 | 4.0.1 |
References
- Weakness (CWE)
-- Platform
- Composer, Drupal
- Package
drupal/block_class- Disclosed
- 23.04.2025
- Updated
- 11.10.2026 12:18
Sources and licenses
OSV / GitHub Advisory Database - DRUPAL-CONTRIB-2025-043 - CC BY-SA 2.0; code GPL-2.0-or-later
Vulnerability history: drupal/block_class
All published vulnerabilities of this package (Drupal module), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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