Authentication Bypass Vulnerability in Drupal Internationalization Single Sign-On
CVE-2026-16639

9.8CRITICAL

Key Information:

Vendor

Drupal
Status
Internationalization Single Sign-on
Vendor
CVE Published:
25 August 2026

What is CVE-2026-16639?

The vulnerability in Drupal Internationalization Single Sign-On permits unauthorized access by allowing attackers to bypass authentication mechanisms. This flaw affects various versions of the product, exposing users to potential unauthorized interactions with the application. Organizations using affected versions should ensure urgent remediation to uphold security.

Affected Version(s)

Internationalization Single Sign-On 0.0.0 < 1.8.0

References

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

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Drew Webber (mcdruid)
Florent Torregrosa (grimreaper)
Drew Webber (mcdruid)
Bram Driesen (bramdriesen)
Greg Knaddison (greggles)
Drew Webber (mcdruid)
Juraj Nemec (poker10)
.