CVE-2026-16639 — CRITICAL (9.8)

Vulnerability Description

Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Internationalization Single Sign-On allows Authentication Bypass. This issue affects Internationalization Single Sign-On versions: from 0.0.0 to 1.8.0.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-288

References

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

FAQ

What is CVE-2026-16639?

CVE-2026-16639 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Internationalization Single Sign-On allows Authentication Bypass. This issue affects Internationalization Single Sign-O...

How severe is CVE-2026-16639?

CVE-2026-16639 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-16639?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.