CVE-2026-25313: FluentForm Auth Bypass Vulnerability

CVE-2026-25313 Overview

CVE-2026-25313 is a Missing Authorization vulnerability (CWE-862) affecting the FluentForm WordPress plugin developed by Shahjahan Jewel. This Broken Access Control flaw allows attackers to exploit incorrectly configured access control security levels, potentially gaining unauthorized access to plugin functionality and data.

The vulnerability stems from improper authorization checks within the FluentForm plugin, enabling unauthenticated or low-privileged users to perform actions that should be restricted to administrators or higher-privileged roles.

Critical Impact

Attackers can bypass access control mechanisms in FluentForm, potentially allowing unauthorized manipulation of form data, settings, or sensitive information collected through forms.

Affected Products

• FluentForm WordPress Plugin versions through 6.1.14
• WordPress installations running vulnerable FluentForm versions

Discovery Timeline

• 2026-02-19 - CVE CVE-2026-25313 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-25313

Vulnerability Analysis

This Missing Authorization vulnerability in FluentForm represents a classic Broken Access Control issue where the plugin fails to properly verify user permissions before allowing access to protected functionality. The flaw enables attackers to exploit incorrectly configured access control security levels, bypassing intended authorization restrictions.

FluentForm is a popular WordPress form builder plugin, and forms often collect sensitive user data including personal information, payment details, and contact information. A missing authorization check in such a plugin creates significant risk, as attackers could potentially access, modify, or exfiltrate form submissions and configuration data.

The vulnerability affects all versions of FluentForm from the initial release through version 6.1.14, indicating that the authorization flaw has been present in the codebase for an extended period.

Root Cause

The root cause of CVE-2026-25313 is the absence of proper authorization checks (CWE-862) in one or more plugin endpoints or functions. The FluentForm plugin fails to verify that the current user has the appropriate capabilities or roles before processing requests, allowing unauthorized access to restricted features.

In WordPress plugins, authorization should typically be implemented using capability checks via functions like current_user_can() before executing privileged operations. The absence or improper implementation of these checks leads to this vulnerability.

Attack Vector

The attack vector for this vulnerability involves sending crafted requests to vulnerable FluentForm endpoints without proper authentication or with insufficient privileges. Since the authorization checks are missing, the plugin processes these requests as if they originated from an authorized user.

An attacker with knowledge of the vulnerable endpoints can interact with protected plugin functionality. The specific exploitation method depends on which FluentForm features lack proper authorization, but could include accessing form submissions, modifying form configurations, or manipulating plugin settings.

For detailed technical information about this vulnerability, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2026-25313

Indicators of Compromise

• Unexpected access to FluentForm administrative functions by non-privileged users
• Anomalous API requests to FluentForm plugin endpoints from unauthenticated sessions
• Unauthorized modifications to form configurations or settings
• Unusual data access patterns for form submissions in access logs

Detection Strategies

• Monitor WordPress access logs for requests to FluentForm plugin endpoints from unauthorized sources
• Implement Web Application Firewall (WAF) rules to detect and block suspicious requests targeting FluentForm
• Review plugin-specific audit logs for unauthorized configuration changes
• Deploy endpoint detection and response (EDR) solutions to identify exploitation attempts

Monitoring Recommendations

• Enable verbose logging for FluentForm plugin activities and WordPress REST API calls
• Set up alerts for failed authorization attempts or unusual access patterns
• Monitor for plugin file modifications that may indicate tampering
• Implement real-time monitoring of form submission access and data exports

How to Mitigate CVE-2026-25313

Immediate Actions Required

• Update FluentForm to the latest patched version immediately
• Review FluentForm plugin settings and restrict access to administrative functions
• Audit recent form submissions and configuration changes for signs of unauthorized access
• Implement additional access controls through WordPress user role management

Patch Information

Users should update the FluentForm plugin to a version newer than 6.1.14 that addresses this vulnerability. Check the Patchstack vulnerability database for the latest patch information and remediation guidance.

WordPress administrators can update the plugin through the WordPress admin dashboard under Plugins > Installed Plugins, or by using WP-CLI for command-line updates.

Workarounds

• Temporarily disable the FluentForm plugin if immediate patching is not possible
• Restrict access to WordPress admin areas using IP-based access controls
• Implement additional authentication layers using security plugins
• Use a Web Application Firewall (WAF) to filter malicious requests targeting FluentForm endpoints

# WordPress CLI plugin update command
wp plugin update fluentform --path=/var/www/html

# Verify plugin version after update
wp plugin get fluentform --field=version --path=/var/www/html

# Temporary disable if patch unavailable
wp plugin deactivate fluentform --path=/var/www/html