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  4. CVE 2026 16639 internationalization single sign on critical
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Back to active CVEs
Critical · CVSS 9.8CVE-2026-16639

Internationalization Single Sign-On - Critical - Access bypass - SA-CONTRIB-2026-081CVE-2026-16639

Answer in brief

CVE-2026-16639 records a Critical severity (CVSS 9.8) vulnerability in Internationalization Single Sign-On - Critical - Access bypass - SA-CONTRIB-2026-081. The current sources do not mark it as known exploited. The current feed maps Drupal/Internationalization Single Sign-On (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 28, 2026Source checked Oct 10, 2026First seen by HOL Aug 25, 2026Material review Aug 28, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Drupal/Internationalization Single Sign-On (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Drupal/Internationalization Single Sign-Ongeneric>=0.0.0 <1.8.01.8.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Drupal/Internationalization Single Sign-On.
  2. 2Review the reported fix. Update Drupal/Internationalization Single Sign-On to 1.8.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 25, 2026

Sources and claim methodology

  • Source referencedrupal.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Academy LMS <= 4.0.3 - Authenticated (Custom+) Privilege Escalation to add_child REST endpointSame generic ecosystem
  • Academy LMS <= 4.0.3 - Missing Authorization to Authenticated (Custom+) Arbitrary Academy Comment Deletion via delete_lesson_comment AJAX — Attacker-Controlled course_id vs. Target comment_idSame generic ecosystem
  • MariaDB: mysql_json plugin OOB readsSame generic ecosystem
  • MariaDB: environment injection via wsrep bootstrap in the mariadb.service fileSame generic ecosystem
  • MariaDB Connector/C: libmariadb allowed cleartext password leakage on TLS hostname verification failureSame generic ecosystem
  • x64dbg-MCP Server vulnerable to pre-authentication denial of service through Content-Length integer overflowSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-288
Source
CVE List V5
Source checked
Oct 10, 2026
References
1 linked source
Open source record