[IT-SecNots] [Security-news] Extended HTML Filter - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-309

[security-news AT drupal.org]

View online: https://www.drupal.org/sa-contrib-2026-309

Project: Extended HTML Filter [1]
Project machine name: extended_html_filter
Date: 2026-November-04
Security risk: *Moderately critical* 14 ∕ 25
AC:Basic/A:User/CI:Some/II:Some/E:Theoretical/TD:All [2]
Vulnerability: Cross-site scripting

Affected versions: <1.0.4
CVE IDs: CVE-2026-122078
Description: 
The Extended HTML Filter module allows using style attributes in CKEditor.

The module XSS filter does not sufficiently sanitize certain HTMX attributes,
which can lead to a cross-site scripting (XSS) vulnerability.

The vulnerability is mitigated by the fact an attacker must be able to insert
HTML with specific attributes.

Solution: 
Install the latest version:

 * Upgrade to Extended HTML Filter 1.0.4 [3].

Reported By: 
 * Pierre Rudloff (prudloff) [4] of the Drupal Security Team

Fixed By: 
 * Saif Bataineh (syfjo) [5]

Coordinated By: 
 * Swan Kalata (akalata) [6] of the Drupal Security Team
 * Pierre Rudloff (prudloff) [7] of the Drupal Security Team
 * Jess  (xjm) [8] of the Drupal Security Team

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Contribution record [9]

[1] https://www.drupal.org/project/extended_html_filter
[2] https://www.drupal.org/drupal-security-team/security-risk-levels-defined
[3] https://www.drupal.org/project/extended_html_filter/releases/1.0.4
[4] https://www.drupal.org/u/prudloff
[5] https://www.drupal.org/u/syfjo
[6] https://www.drupal.org/u/akalata
[7] https://www.drupal.org/u/prudloff
[8] https://www.drupal.org/u/xjm
[9]  
https://new.drupal.org/contribution-record?source_link=https%3A//www.drupal.org/node/3628398

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