6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-6365

CVE-2026-6365: Drupal core - Critical - Cross-site scripting - SA-CORE-2026-001

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: from 8.0.0 before 10.5.9, from 10.6.0 before 10.6.7, from 11.0.0 before 11.2.11, from 11.3.0 before 11.3.7.

(GitHub Advisory)

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CVE-2026-6365

CVE-2026-6365:

6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation NoneAutomatable NoTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
drupal/core	composer	>= 8.0.0, < 10.5.9	10.5.9
drupal/core	composer	>= 10.6.0, < 10.6.7	10.6.7
drupal/core	composer	>= 11.0.0, < 11.2.11	11.2.11
drupal/core	composer	>= 11.3.0, < 11.3.7	11.3.7

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a Cross-Site Scripting (XSS) issue in Drupal's AJAX API. The analysis started by investigating the provided security advisory URLs. The official Drupal advisory was not directly accessible, so I used Google to find snippets of its content, which pointed to an issue in 'jQuery integration for AJAX modal dialog boxes'. To find the exact code changes, I compared the git tags for a vulnerable and a patched version (11.2.10 vs 11.2.11). This revealed a security patch commit 5d2830cee0223d6867017b27306e3a433faee2ee with the title 'SA-CORE-2026-001'. Analysis of this commit shows changes in the OpenDialogCommand.php file. Specifically, the render() method was modified to sanitize button attributes within the dialog options using Xss::filter(). The vulnerability lies in the fact that unsanitized data, which could contain malicious scripts, was being passed to the client-side for rendering a dialog box. The render() function is the last point on the server-side where this data is handled before being sent in the AJAX response, making it the key function to identify for this vulnerability.

Vulnerable functions

Drupal\Core\Ajax\OpenDialogCommand::render

lib/Drupal/Core/Ajax/OpenDialogCommand.php

The `render` function in the `OpenDialogCommand` class processes dialog options, including button attributes, to be sent to the client-side as part of an AJAX response. Prior to the patch, this function did not sanitize the values for button attributes (like 'label' or 'text'). This allowed an attacker to inject malicious JavaScript code, which would then be executed by the browser when the jQuery UI dialog is created. The patch adds sanitization using `Xss::filter` to these attribute values, mitigating the Cross-Site Scripting (XSS) vulnerability.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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