Vulnerability · Published Apr 23, 2025 · Assigned by drupal
CVE-2025-3902Block Class - Moderately critical - Cross Site Scripting - SA-CONTRIB-2025-043
Medium 6.1
In plain English
A medium-severity cross-site scripting in Block Class from Drupal. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 84.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 Class: from 4.0.0 before 4.0.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist:https://packages.drupal.org/8 | drupal/block_class | 4.0.1 | DRUPAL-CONTRIB-2025-043 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Drupal | Block Class | 4.0.0 – before 4.0.1 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N