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9.8

Drupal Single Sign-On can be bypassed to log in

CVE-2026-16639 · published 2 months ago
Summary

Drupal sites that use the Internationalization Single Sign-On add‑on up to version 1.8.0 may let someone get in without a valid password by taking an unexpected route. This could give the attacker access to the site’s admin area and any data it holds. Update the add‑on to the newest version or disable it until a fix is applied.

Original advisory text
Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Internationalization Single Sign-On allows Authentication Bypass. This issue affects Internationalization Single Sig...
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.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-288Authentication Bypass Using Alternate Path
Timeline
Published25 Aug 2026
Updated4 Nov 2026
First seen25 Aug 2026
Sources
CVE-2026-16639 · NVD
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