Vulnerability in Drupal Internationalization Single Sign-On (CVE-2026-16639)
Summary
Vulnerability in Drupal Internationalization Single Sign-On (CVE-2026-16639). Successful exploitation can lead to full system takeover.
Original description
The description as published by the source.
In a scenario of a multilingual website with different domain names per language, this module enables you to be automatically connected across the language domains if you are logged on the main language domain.
The module doesn't sufficiently validate a short-lived token, allowing an attacker to bypass access control and authenticate as a victim user.
This vulnerability is mitigated by the fact that an attacker must appear to originate from the same client IP as the victim.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-16639 has been found in Drupal Internationalization Single Sign-On.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Drupal Internationalization Single Sign-On CVE-2026-16639" on the vendor's site.
CVE-2026-16639 (Drupal Internationalization Single Sign-On) — CWE-288 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-288) exists in Drupal Internationalization Single Sign-On.
Check the vendor advisory for the affected versions of Drupal Internationalization Single Sign-On.
Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Drupal Internationalization Single Sign-On を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- web nvd.nist.gov
- web drupal.org
- web github.com