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  4. CVE 2026 16644 webform rest moderately critical access bypass sa
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Back to active CVEs
Critical · CVSS 9.1CVE-2026-16644

Webform REST - Moderately critical - Access bypass - SA-CONTRIB-2026-087CVE-2026-16644

Answer in brief

CVE-2026-16644 records a Critical severity (CVSS 9.1) vulnerability in Webform REST - Moderately critical - Access bypass - SA-CONTRIB-2026-087. The current sources do not mark it as known exploited. The current feed maps Drupal/Webform REST (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 9.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.1. 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/Webform REST (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Drupal/Webform RESTgeneric>=0.0.0 <4.1.04.1.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Drupal/Webform REST.
  2. 2Review the reported fix. Update Drupal/Webform REST to 4.1.0 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

Incorrect Authorization vulnerability in Drupal Webform REST allows Forceful Browsing. This issue affects Webform REST versions: from 0.0.0 to 4.1.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Appointment Booking Calendar <= 1.6.11.11 - Incorrect Authorization to Unauthenticated Sensitive Field Modification via Appointment Public TokenAlso CWE-863
  • Fluent Forms <= 6.2.14 - Reflected Cross-Site Scripting via '{get.*}' Editor SmartCode ParameterSame generic ecosystem
  • Download Manager <= 3.3.71 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'regurl' Shortcode AttributeSame generic ecosystem
  • Anti-Spam by CleanTalk <= 6.88 - Unauthenticated Stored Cross-Site Scripting via Comment Content via ContactsEncoder Greedy RegexSame generic ecosystem
  • Simple Newsletter Plugin <= 4.3.10 - Unauthenticated Stored Cross-Site Scripting via Subscriber Custom Field via Manage Preferences Form + Campaign Preview noptin_key PivotSame generic ecosystem
  • HivePress <= 1.7.31 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Listing Attribute Value in Administrator-configured HTML FormatSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-863
Source
CVE List V5
Source checked
Oct 10, 2026
References
1 linked source
Open source record