CVE-2026-55805

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Stored XSS 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 Stored XSS. This issue affects Drupal core versions: from 0.0.0 to 10.6.13, from 11.3.0 to 11.3.14, from 11.4.0 to 11.4.4, from 0.0.0 to 11.0.*, from 0.0.0 to 11.1.*, 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

2026-09-13

NVD

CVE-2026-55805

EUVD

EUVD-2026-66183

Affected Vendors & Products

Vendor	Product	Version / Range
drupal	drupal_core	From 0.0.0 (inc) to 10.6.13 (inc)
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 11.0.0 (inc)
drupal	drupal_core	From 11.1.0 (inc)
drupal	drupal_core	From 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 Stored Cross-site Scripting (XSS) vulnerability in Drupal core. It allows malicious scripts to be stored on the server and then executed in the browsers of users who view the affected pages. The flaw exists due to improper neutralization of user input during web page generation.

Detection Guidance

To detect this Drupal XSS vulnerability, check your Drupal version against affected ranges (10.6.13 or below, 11.3.14 or below, 11.4.4 or below, or any 11.0.*, 11.1.*, 11.2.* versions). Use commands like 'drush pm:list' or check 'core/CHANGELOG.txt' for version details.

Impact Analysis

An attacker could exploit this to steal user sessions, deface websites, or perform actions on behalf of users. Users visiting compromised pages may have their data exposed or their accounts hijacked without their knowledge.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR's data protection requirements and HIPAA's security rules. Organizations may face fines, legal action, and reputational damage if user data is compromised due to this flaw.

Mitigation Strategies

Update Drupal core to the latest version (10.6.14 or later, 11.3.15 or later, 11.4.5 or later) to address the Stored XSS vulnerability.

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