[IT-SecNots] [Security-news] Internationalization Single Sign-On - Critical - Access bypass - SA-CONTRIB-2026-081

[security-news AT drupal.org]

View online: https://www.drupal.org/sa-contrib-2026-081

Project: Internationalization Single Sign-On [1]
Date: 2026-July-22
Security risk: *Critical* 15 ∕ 25
AC:Complex/A:None/CI:Some/II:Some/E:Theoretical/TD:All [2]
Vulnerability: Access bypass

Affected versions: <1.8.0
CVE IDs: CVE-2026-16639
Description: 
In a scenario of a multilingual website with different domain names per
language, this module enables you to be automatically connected across the
language domains if you are logged on the main language domain.

The module doesn't sufficiently validate a short-lived token, allowing an
attacker to bypass access control and authenticate as a victim user.

This vulnerability is mitigated by the fact that an attacker must appear to
originate from the same client IP as the victim.

Solution: 
Install the latest version:

 * If you use the Internationalization Single Sign-On module upgrade to
   i18n_sso 8.x-1.8 [3]

Reported By: 
 * Drew Webber (mcdruid) [4] of the Drupal Security Team

Fixed By: 
 * Florent Torregrosa (grimreaper) [5]
 * Drew Webber (mcdruid) [6] of the Drupal Security Team

Coordinated By: 
 * Bram Driesen (bramdriesen) [7] of the Drupal Security Team
 * Greg Knaddison (greggles) [8] of the Drupal Security Team
 * Drew Webber (mcdruid) [9] of the Drupal Security Team
 * Juraj Nemec (poker10) [10] of the Drupal Security Team

------------------------------------------------------------------------------
Contribution record [11]

[1] https://www.drupal.org/project/i18n_sso
[2] https://www.drupal.org/security-team/risk-levels
[3] https://www.drupal.org/project/i18n_sso/releases/8.x-1.8
[4] https://www.drupal.org/u/mcdruid
[5] https://www.drupal.org/u/grimreaper
[6] https://www.drupal.org/u/mcdruid
[7] https://www.drupal.org/u/bramdriesen
[8] https://www.drupal.org/u/greggles
[9] https://www.drupal.org/u/mcdruid
[10] https://www.drupal.org/u/poker10
[11]  
https://new.drupal.org/contribution-record?source_link=https%3A//www.drupal.org/node/3606350

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