Vulnerability · Published Aug 25, 2026 · Assigned by drupal
CVE-2026-16644Webform REST - Moderately critical - Access bypass - SA-CONTRIB-2026-087
Critical 9.1
In plain English
A critical-severity incorrect authorization in Webform REST from Drupal. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.4%top 61.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist:https://packages.drupal.org/8 | drupal/webform_rest | 4.1.0 | DRUPAL-CONTRIB-2026-087 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Drupal | Webform REST | 0.0.0 – before 4.1.0 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N