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".
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-3902US | — | — | ||
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Drupal Block Class allows Cross-Site Scripting (XSS).This issue affects Block… | ||||
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references
External citations — patches, advisories, analysis.
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