# CVE-2026-16639

## Summary

- **CVE ID:** CVE-2026-16639
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-288
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 26, 2026

## 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 (0.0.0)

## References

- [CNA](https://www.drupal.org/sa-contrib-2026-081)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 27.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._