CVE-2025-3902

mediumpriority · track · 0EPSS 0.002 · 16 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.25% (16th) EPSS

CVSS 6.1 · medium

Is it mine?

5 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.1

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · ENISA EU

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondaryexploitability 2.8 · impact 2.7

v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79US

affected products (5)

Products and version ranges known to be affected.

Open Source Drupal Block Class <4.0.1all versionscert_bundDE
Open Source Drupal≤ Block Class <4.0.1cert_bundDE
Drupal Block Class4.0.0 → 4.0.1enisa_euvdEU
four kitchens block class4.0.0 → 4.0.1nvdUScpe:2.3:a:four_kitchens:block_class:*:*:*:*:*:*:*:*
Packagist:https://packages.drupal.org/8 drupal/block_class4.0.0 → 4.0.1osvUSpkg:composer/drupal/block_class?repository_url=https:%2F%2Fpackages.drupal.org%2F8

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-0881Drupal Extensions: Mehrere SchwachstellenDeutsch2025-04-23csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in verschiedenen Drupal Extensions ausnutzen, um einen Cross-Site Scripting- oder CSRF-Angriff durchzuführen oder weitere nicht spezifizierte Angriffe durchzuführen.
DRUPAL-CONTRIB-2025-0432025-04-23vendor · osvUS
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".

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2025-04-23modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

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