What is the CVSS score of EUVD-2025-18291?

EUVD-2025-18291 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L. EPSS exploitation probability: 0.1%.

Which versions of PHP are affected by EUVD-2025-18291?

A Cross-Site Scripting (XSS) vulnerability in Drupal Simple Klaro (versions before 1.10.0) allows attackers to inject malicious scripts that execute in users' browsers, potentially compromising user…. A patch is available.

How to fix or mitigate EUVD-2025-18291?

Within 24 hours: Inventory all Drupal instances running Simple Klaro and identify affected versions (0.0.0 to 1.9.x). Within 7 days: Implement WAF rules to filter suspicious input to the affected module, disable the module if non-critical, or restrict access via network controls. Within 30 days: Upgrade to Simple Klaro version 1.10.0 or later once released and tested in a staging environment.

PHP EUVD-2025-18291

| CVE-2025-48918 HIGH

Cross-site Scripting (XSS) (CWE-79)

2025-06-13 mlhess@drupal.org

XSS Drupal PHP Simple Klaro

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

Low

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

EUVD ID Assigned

Mar 14, 2026 - 21:34 euvd

EUVD-2025-18291

Analysis Generated

Mar 14, 2026 - 21:34 vuln.today

CVE Published

Jun 13, 2025 - 16:15 nvd

HIGH 8.8

DescriptionCVE.org

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Drupal Simple Klaro allows Cross-Site Scripting (XSS).This issue affects Simple Klaro: from 0.0.0 before 1.10.0.

AnalysisAI

Stored/Reflected Cross-Site Scripting (XSS) vulnerability in Drupal Simple Klaro module versions before 1.10.0 that fails to properly neutralize user input during web page generation. An unauthenticated remote attacker can inject malicious scripts that execute in victims' browsers with high impact on confidentiality and integrity, though the attack requires user interaction (clicking a malicious link). The vulnerability has a high CVSS score of 8.8 due to its network-based attack vector and broad scope, but real-world exploitation likelihood depends on KEV/EPSS data not provided in available intelligence.

Technical ContextAI

The Drupal Simple Klaro module (CPE identifier likely: cpe:2.3:a:drupal:simple_klaro:*:*:*:*:*:*:*:*) is a consent management extension for Drupal that integrates the Klaro.js cookie consent library. The vulnerability stems from CWE-79 (Improper Neutralization of Input During Web Page Generation), indicating the module fails to sanitize or escape user-controlled input before rendering it in HTML context. This allows attackers to inject arbitrary JavaScript code that executes within the security context of the Drupal site. The root cause likely involves inadequate use of Drupal's sanitization APIs (such as XSS::filter() or proper output escaping) when processing Klaro configuration parameters, consent preferences, or related UI elements. Version 0.0.0 through 1.9.x are vulnerable; patching occurred at version 1.10.0.

RemediationAI

action: Immediate Patching; details: Upgrade Drupal Simple Klaro module to version 1.10.0 or later. Check Drupal.org module page for security advisory and update links.
action: Verification; details: After patching, clear Drupal caches (drush cache:rebuild or via admin UI) and verify module version via /admin/modules or drush status.
action: Workaround (Temporary); details: If immediate patching is not feasible, disable the Simple Klaro module until patch is applied. Implement alternative cookie consent via other secure modules or hardcoded HTML until remediated.
action: Code Review; details: Audit any custom Drupal code that integrates with Simple Klaro to ensure downstream sanitization is applied if user data is processed.
action: Security Headers; details: Implement Content-Security-Policy (CSP) headers to mitigate XSS impact: Content-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'.
action: References; details: Consult Drupal Security Advisory: https://www.drupal.org/project/simple_klaro (check security advisories tab) and https://security.drupal.org for official guidance.