CVE-2026-15917

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Cross-Site Scripting in Drupal Core

Publication date: 2026-08-25

Last updated on: 2026-08-28

Assigner: Drupal.org

Description

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 11.3.0 to 11.3.14, from 11.4.0 to 11.4.4, from 0.0.0 to 11.2.*.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-25

Last Modified

2026-08-28

Generated

2026-09-15

AI Q&A

2026-08-26

EPSS Evaluated

2026-09-14

NVD

CVE-2026-15917

EUVD

EUVD-2026-66184

Affected Vendors & Products

Vendor	Product	Version / Range
drupal	drupal_core	From 11.3.0 (inc) to 11.3.14 (inc)
drupal	drupal_core	From 11.4.0 (inc) to 11.4.4 (inc)
drupal	drupal_core	From 0.0.0 (inc) to 11.2.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This is a Cross-Site Scripting (XSS) vulnerability in Drupal core. It occurs when user input is not properly neutralized during web page generation, allowing attackers to inject malicious scripts into web pages viewed by other users.

Detection Guidance

To detect this XSS vulnerability in Drupal, check your Drupal core version against affected ranges (11.3.0-11.3.14, 11.4.0-11.4.4, or 11.2.*). Use commands like 'drush core-status' or inspect the version in the admin panel. If vulnerable, update immediately.

Impact Analysis

An attacker could exploit this to steal user sessions, deface websites, or perform actions on behalf of users. It may lead to unauthorized data access or manipulation if users interact with the compromised pages.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR's data protection requirements or HIPAA's security rules. Organizations may face fines or penalties for failing to protect user data adequately.

Mitigation Strategies

Update Drupal core to a version that is not affected by this vulnerability. Specifically, upgrade to a version beyond 11.3.14 or 11.4.4 depending on your current installation.

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