Read the docs
TI-2026-13886 Aliases CVE-2026-16639GHSA-p748-p4j4-gpx6

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

Priority MEDIUM 50CWE-288Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-288.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00643 51st percentileScored 2026-11-07
Fix Fixed Internationalization Single Sign-On (Drupal): 1.8.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
DrupalInternationalization Single Sign-On0.0.0 to before 1.8.01.8.0Patch availableCNA
  • Internationalization Single Sign-On VendorDrupal Affected 0.0.0 to before 1.8.0 Fixed in 1.8.0 Patch available CNA

Remediation

  • Fix · CNA Internationalization Single Sign-On (Drupal) Fixed in 1.8.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-16639
  2. 2026-10-03 Alias added: GHSA-p748-p4j4-gpx6
  3. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Other 1

  • TI-2026-07979 Drupal core - Highly critical - SQL injection - SA-CORE-2026-004 KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-05494 Drupal core - Highly critical - Remote Code Execution - SA-CORE-2018-004 KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-05493 Improper input validation in Drupal before 7.58, 8.x before 8.3.9, 8.4.x before 8.4.6… KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-10731 Unrestricted file upload in Drupal Core KEVCVSS 3.1HIGH 8.8
  • TI-2019-04505 Drupal core - Highly critical - Remote Code Execution KEVCVSS 3.1HIGH 8.1
  • TI-2020-17477 Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks… KEVCVSS 3.1HIGH 7.8
See all 941 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences