Paper/Archive/CVE-2026-16639

CVE-2026-16639

Drupal Internationalization Single Sign-On — Internationalization Single Sign-On - Critical - Access bypass - SA-CONTRIB-2026-081

EPSS 0.6%CVSS 9.8

critical.is priorityof 100

CVSS 9.8 (ADP)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 50.8.508 × 2010.2 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

Internationalization Single Sign-On0.0.0 – < 1.8.01.8.0CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refdrupal.org/sa-contrib-2026-081