What’s Vulnerable › Vulnerabilities

CVE-2026-16639: Internationalization Single Sign-On - Critical - Access bypass - SA-CONTRIB-2026-081

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-08-28
• Weakness: CWE-288

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.

Affected products

• Drupal Internationalization Single Sign-On: before 1.8.0 — fixed in 1.8.0

How to fix

Upgrade to a fixed version: Drupal Internationalization Single Sign-On 1.8.0. Check the vendor advisory for mitigations.

References

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

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