CVE-2026-11578: Fluent Forms Privilege Escalation Flaw

CVE-2026-11578 Overview

CVE-2026-11578 is a broken access control vulnerability in the Fluent Forms WordPress plugin before version 6.2.5. The plugin fails to properly restrict deletion of form submission entries to only the forms a restricted Manager is authorized to manage. A Manager limited to specific forms can permanently delete submission entries belonging to forms outside their assigned scope.

Exploitation requires a non-default configuration where an administrator has created at least one Manager restricted to specific forms. The issue affects data integrity and availability of submission records but does not expose the contents of those submissions.

Critical Impact
An authenticated Manager with restricted form permissions can permanently delete submission entries from forms they are not authorized to manage, resulting in loss of collected form data.

Affected Products

Fluent Forms WordPress plugin versions prior to 6.2.5
WordPress installations with Fluent Forms Manager roles configured with form-level restrictions
Sites relying on Fluent Forms for critical submission data collection

Discovery Timeline

2026-07-02 - CVE-2026-11578 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-11578

Vulnerability Analysis

The vulnerability is a broken access control flaw affecting the submission entry deletion workflow in Fluent Forms. The plugin supports a permission model where administrators can create Manager users and restrict their access to a specific subset of forms. This model is intended to enforce boundaries between different teams or business units sharing a single WordPress site.

When a restricted Manager invokes the entry deletion action, the plugin verifies the user has the general capability to manage form entries. It does not verify that the target entry belongs to a form within the Manager's permitted scope. As a result, a Manager can craft or manipulate a deletion request referencing any entry ID and remove that entry from the database.

The impact is limited to integrity of submission data. The flaw does not disclose entry contents or grant additional privileges beyond deletion.

Root Cause

The root cause is a missing authorization check in the entry deletion handler. The plugin enforces role-based permissions but omits an ownership check comparing the target entry's parent form against the Manager's allowed form list. This is a classic instance of Insecure Direct Object Reference combined with missing authorization on a state-changing operation.

Attack Vector

An attacker must first hold a Manager account with restricted form permissions on the target site. The attacker submits a deletion request through the plugin's administrative interface or REST endpoint, supplying an entry ID belonging to a form outside their assigned scope. The plugin processes the request and deletes the entry without validating form ownership. The vulnerability requires a non-default administrator configuration to be exploitable.

No verified public exploit code is available. Refer to the WPScan Vulnerability Report for additional technical context.

Detection Methods for CVE-2026-11578

Indicators of Compromise

Unexpected deletion of Fluent Forms submission entries not attributable to administrator activity
Entry deletion actions in WordPress audit logs performed by Manager accounts against forms outside their assigned scope
Gaps or missing IDs in the wp_fluentform_submissions table where entries previously existed

Detection Strategies

Review WordPress activity logs for fluentform entry deletion events and correlate the acting user's assigned form permissions against the deleted entry's parent form
Monitor REST API and admin-ajax requests targeting Fluent Forms deletion endpoints for calls originating from restricted Manager accounts
Establish a baseline of expected entry deletion volume per Manager and alert on statistical anomalies

Monitoring Recommendations

Enable database-level auditing on the Fluent Forms submissions table to capture DELETE operations with user attribution
Forward WordPress and web server logs to a centralized SIEM for correlation of Manager account activity across forms
Alert on any deletion request where the entry's form_id does not match the acting Manager's permitted form list

How to Mitigate CVE-2026-11578

Immediate Actions Required

Update the Fluent Forms plugin to version 6.2.5 or later on all WordPress sites where it is installed
Audit existing Manager accounts and remove form-level restrictions that are no longer required, or convert affected users to full administrators only if trust warrants it
Review recent submission deletion activity to identify any unauthorized removals prior to patching

Patch Information

Upgrade Fluent Forms to version 6.2.5 or later. The patched release adds the missing form ownership check to the submission deletion handler, ensuring restricted Managers can only delete entries belonging to forms within their assigned scope. See the WPScan Vulnerability Report for advisory details.

Workarounds

Temporarily remove form-scoped restrictions from Manager accounts and grant deletion permissions only to fully trusted administrators until the patch is applied
Revoke the entry deletion capability from Manager roles using a role editor plugin until upgrading to 6.2.5
Implement regular database backups of the Fluent Forms submissions table to enable recovery from unauthorized deletions

bash

# Update Fluent Forms via WP-CLI
wp plugin update fluentform --version=6.2.5
wp plugin list --name=fluentform --fields=name,status,version