Webform rest: This module enables you to retrieve and submit webform submissions via REST endpoints. (CVE-2026-16644)
The Drupal webform_rest module versions prior to 4.0.3 contain a vulnerability where the module does not sufficiently verify the parent webform's permissions for creating, viewing, and updating submissions via REST endpoints. This issue affects unsupported versions 4.0.3 and earlier. Exploitation requires the attacker to already have permissions to use the REST resource, which mitigates the risk to some extent.
AI Analysis
Technical Summary
The webform_rest module for Drupal enables retrieval and submission of webform data through REST endpoints. Versions before 4.0.3 do not adequately check the parent webform's permissions for create, view, and update operations, potentially allowing unauthorized access or modification of webform submissions. However, exploitation is limited because an attacker must already possess permissions to access the REST resource. This vulnerability affects unsupported versions 4.0.3 and earlier.
Potential Impact
An attacker with existing permissions to use the REST resource could bypass intended permission checks on the parent webform, potentially leading to unauthorized creation, viewing, or updating of webform submissions. Since the vulnerability requires prior access permissions, the impact is limited to users who already have some level of access.
Mitigation Recommendations
This vulnerability affects unsupported versions 4.0.3 and earlier. No official patch or fix is available for these versions. Users are advised to upgrade to a supported version beyond 4.0.3 where this issue is resolved. Since the vulnerability requires existing REST resource permissions, restricting access to the REST endpoints can reduce risk.
Webform rest: This module enables you to retrieve and submit webform submissions via REST endpoints. (CVE-2026-16644)
Description
The Drupal webform_rest module versions prior to 4.0.3 contain a vulnerability where the module does not sufficiently verify the parent webform's permissions for creating, viewing, and updating submissions via REST endpoints. This issue affects unsupported versions 4.0.3 and earlier. Exploitation requires the attacker to already have permissions to use the REST resource, which mitigates the risk to some extent.
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The webform_rest module for Drupal enables retrieval and submission of webform data through REST endpoints. Versions before 4.0.3 do not adequately check the parent webform's permissions for create, view, and update operations, potentially allowing unauthorized access or modification of webform submissions. However, exploitation is limited because an attacker must already possess permissions to access the REST resource. This vulnerability affects unsupported versions 4.0.3 and earlier.
Potential Impact
An attacker with existing permissions to use the REST resource could bypass intended permission checks on the parent webform, potentially leading to unauthorized creation, viewing, or updating of webform submissions. Since the vulnerability requires prior access permissions, the impact is limited to users who already have some level of access.
Mitigation Recommendations
This vulnerability affects unsupported versions 4.0.3 and earlier. No official patch or fix is available for these versions. Users are advised to upgrade to a supported version beyond 4.0.3 where this issue is resolved. Since the vulnerability requires existing REST resource permissions, restricting access to the REST endpoints can reduce risk.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- DRUPAL-CONTRIB-2026-087
- Osv Schema Version
- 1.7.0
- Aliases
- ["CVE-2026-16644"]
- Ecosystems
- ["Packagist:https://packages.drupal.org/8"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a6151309c2644c7f8da72b4
Added to database: 07/22/2026, 23:24:32 UTC
Last enriched: 07/23/2026, 00:10:02 UTC
Last updated: 07/23/2026, 00:10:02 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.