drupal core: Cross-site Scripting -- Remote with User Interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1367
     Drupal core - Critical - Cross-site scripting - SA-CORE-2021-002
                               22 April 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           drupal core
Publisher:         Drupal
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade

Original Bulletin: 
   https://www.drupal.org/sa-core-2021-002

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Drupal core - Critical - Cross-site scripting - SA-CORE-2021-002

Project: Drupal core

Date: 2021-April-21

Security risk: 
Critical 15∕25 AC:Basic/A:None/CI:Some/II:Some/E:Theoretical/TD:Default

Vulnerability: Cross-site scripting

Description: 
Drupal core's sanitization API fails to properly filter cross-site scripting
under certain circumstances.

Not all sites and users are affected, but configuration changes to prevent the
exploit might be impractical and will vary between sites. Therefore, we 
recommend all sites update to this release as soon as possible.

Solution: 
Install the latest version:

If you are using Drupal 9.1, update to Drupal 9.1.7.
If you are using Drupal 9.0, update to Drupal 9.0.12.
If you are using Drupal 8.9, update to Drupal 8.9.14.
If you are using Drupal 7, update to Drupal 7.80.

Versions of Drupal 8 prior to 8.9.x are end-of-life and do not receive security coverage.

Reported By: 
Jasper Mattsson

Fixed By: 
Alex Pott of the Drupal Security Team
Jasper Mattsson
Michael Hess of the Drupal Security Team
Wim Leers
Heine of the Drupal Security Team
Peter Wolanin of the Drupal Security Team
Jess (xjm) of the Drupal Security Team
Samuel Mortenson of the Drupal Security Team
nwellnhof
Alex Bronstein of the Drupal Security Team
Lee Rowlands of the Drupal Security Team
Adam G-H
Drew Webber of the Drupal Security Team

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