{"id":"CVE-2025-3902","aliases":["DRUPAL-CONTRIB-2025-043","EUVD-2025-12162","GHSA-v484-6wmj-xwfq"],"status":"published","title":"Block Class - Moderately critical - Cross Site Scripting - SA-CONTRIB-2025-043","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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00246,"percentile":0.16034,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2025-04-23T16:59:01Z","modified":"2026-10-28T02:31:14Z","fixes":[{"ecosystem":"Packagist:https://packages.drupal.org/8","package":"drupal/block_class","fixed_in":["4.0.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Packagist:https://packages.drupal.org/8","package":"drupal/block_class","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.0.1"}]}]}],"products":[{"vendor":"drupal","product":"block class"},{"vendor":"four_kitchens","product":"block_class"}],"references":[{"url":"https://www.drupal.org/sa-contrib-2025-043","tags":["Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-3902","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-v484-6wmj-xwfq"},{"url":"https://git.drupalcode.org/project/block_class","tags":["web"]},{"url":"https://www.drupal.org/project/block_class","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/3xxx/CVE-2025-3902.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-3902","title":"Block Class - Moderately critical - Cross Site Scripting - SA-CONTRIB-2025-043","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.","status":"published","published":"2025-04-23T17:08:08.048Z","modified":"2025-04-23T18:45:16.583Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:39.039362Z"}],"euvd":[{"id":"EUVD-2025-12162","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.","status":"published","published":"2025-04-23T17:08:08Z","modified":"2025-04-23T18:45:16Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:52:07.950001Z"}],"ghsa":[{"id":"GHSA-v484-6wmj-xwfq","title":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')...","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.","status":"published","published":"2025-04-23T18:31:00Z","modified":"2025-04-23T21:30:36Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:02:00.72042Z"}],"nvd":[{"id":"CVE-2025-3902","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.","status":"published","published":"2025-04-23T17:16:55.983Z","modified":"2026-06-17T09:20:53.607Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:11:01.507281Z"}],"osv":[{"id":"CVE-2025-3902","title":"Block Class - Moderately critical - Cross Site Scripting - SA-CONTRIB-2025-043","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.","status":"published","published":"2025-04-23T17:08:08.048Z","modified":"2026-10-28T02:31:14.000773794Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:44:49.052395Z"},{"id":"DRUPAL-CONTRIB-2025-043","description":"Block Class enables you to add custom attributes to blocks.\n\nThe module did not sufficiently sanitize custom attribute input, allowing for potential XSS attacks when malicious JavaScript was injected as a custom attribute.\n\nThis vulnerability is mitigated by the fact that an attacker must have a role with the permission \"administer block classes\".","status":"published","published":"2025-04-23T16:59:01Z","modified":"2026-09-10T03:45:37.093409779Z","updated_at":"2026-11-02T15:46:13.900249Z"}]}}