CVE-2026-2707 in weForms Plugin
Summary
by MITRE • 03/11/2026
The weForms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the REST API entry submission endpoint in all versions up to, and including, 1.6.27. This is due to inconsistent input sanitization between the frontend AJAX handler and the REST API endpoint. When entries are submitted via the REST API (`/wp-json/weforms/v1/forms/{id}/entries/`), the `prepare_entry()` method in `class-abstract-fields.php` receives the WP_REST_Request object as `$args`, bypassing the `weforms_clean()` fallback that sanitizes `$_POST` data for frontend submissions. The base field handler only applies `trim()` to the value. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts into form entry hidden field values via the REST API that execute when an administrator views the form entries page, where data is rendered using a Vue.js `v-html` directive without escaping.
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Analysis
by VulDB Data Team • 03/17/2026
The vulnerability identified in CVE-2026-2707 affects the weForms WordPress plugin, specifically targeting versions up to and including 1.6.27. This represents a critical stored cross-site scripting flaw that leverages the plugin's REST API endpoint for exploitation. The issue stems from inconsistent input sanitization practices between different submission pathways within the plugin's architecture, creating a security gap that can be exploited by authenticated users with subscriber-level privileges or higher. The vulnerability is particularly concerning because it allows attackers to inject malicious scripts that execute when administrators view form entries, creating a persistent threat vector that can compromise the entire WordPress environment.
The technical root cause lies in the differing sanitization approaches between the frontend AJAX handler and the REST API endpoint implementation. When form entries are submitted through the REST API endpoint at `/wp-json/weforms/v1/forms/{id}/entries/`, the `prepare_entry()` method in `class-abstract-fields.php` receives data as a WP_REST_Request object rather than the traditional `$_POST` data structure. This bypasses the `weforms_clean()` sanitization function that normally processes frontend submissions, leaving the data vulnerable to injection attacks. The base field handler only applies basic `trim()` operations to values without proper HTML escaping or sanitization, creating an opening for malicious script injection. This inconsistency violates secure coding principles and creates a dangerous gap in the plugin's data validation pipeline.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to potentially escalate privileges, steal session cookies, or redirect administrators to malicious sites. When administrators view the form entries page, the Vue.js `v-html` directive renders the stored malicious content without proper HTML escaping, allowing the injected scripts to execute in the context of the administrator's browser session. This creates a persistent threat that remains active until the compromised entries are manually removed or the plugin is updated. The vulnerability is particularly dangerous because it requires minimal privileges to exploit, making it accessible to users who may not have direct administrative access but can still cause significant damage through social engineering or by targeting less security-conscious administrators.
Security mitigations for this vulnerability should focus on immediate plugin updates to versions that address the sanitization inconsistency, along with implementing proper input validation and output escaping mechanisms. Organizations should consider implementing network-level protections such as web application firewalls that can detect and block malicious REST API requests, and establish monitoring procedures to identify unusual submission patterns that might indicate exploitation attempts. The vulnerability aligns with CWE-79 (Cross-Site Scripting) and follows ATT&CK technique T1566 (Phishing) in its exploitation methodology, where the malicious scripts are delivered through compromised form entries and executed when administrators interact with the plugin interface. Additionally, implementing proper principle of least privilege access controls and regular security audits of WordPress plugins can help prevent similar vulnerabilities from being introduced into the system.