CVE-2025-31915 Overview
CVE-2025-31915 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the kamleshyadav Pixel WordPress Form Builder Plugin & Autoresponder (pixel-formbuilder). The flaw impacts all plugin versions up to and including 1.0.3. The vulnerability is classified under CWE-352 and stems from missing or insufficient CSRF protections on state-changing actions. An attacker can trick an authenticated user into submitting forged requests that modify plugin state without the user's consent.
Critical Impact
An attacker who convinces an authenticated WordPress user to visit a malicious page can trigger unauthorized changes within the Pixel Form Builder plugin, affecting integrity and availability of form configurations.
Affected Products
- Pixel WordPress Form Builder Plugin & Autoresponder (pixel-formbuilder) versions up to and including 1.0.3
- WordPress sites with the plugin installed and active
- Authenticated WordPress users targeted through social engineering
Discovery Timeline
- 2025-05-16 - CVE-2025-31915 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-31915
Vulnerability Analysis
The vulnerability is a Cross-Site Request Forgery flaw in the pixel-formbuilder plugin. State-changing endpoints in the plugin do not validate a per-request anti-CSRF token, such as a WordPress nonce, before executing privileged operations. An attacker crafts a malicious HTML page or link that issues a request to a vulnerable plugin endpoint. When an authenticated administrator or privileged user visits the attacker-controlled page, the browser attaches the WordPress session cookies to the forged request. The plugin then executes the requested action under the victim's identity.
User interaction is required, since the victim must load the attacker's content while logged in. The impact is limited to low integrity and low availability effects on the plugin's data, with no direct confidentiality loss.
Root Cause
The root cause is missing verification of CSRF tokens on plugin request handlers. Secure WordPress plugins use wp_nonce_field() and check_admin_referer() or wp_verify_nonce() to bind sensitive actions to a validated token. The affected versions of pixel-formbuilder omit or improperly implement these checks, allowing cross-origin request forgery.
Attack Vector
The attack vector is network-based and requires no privileges on the target site. The attacker hosts a page containing an auto-submitting form or an image tag pointing to the vulnerable plugin endpoint. A logged-in WordPress user with plugin access must be lured into loading the attacker's page. The browser transmits the victim's authenticated session cookie, and the plugin processes the request as legitimate. See the Patchstack WordPress Vulnerability Analysis for additional technical detail.
Detection Methods for CVE-2025-31915
Indicators of Compromise
- Unexpected changes to Pixel Form Builder plugin settings, forms, or autoresponder configurations without a corresponding admin action in the audit log
- HTTP POST requests to pixel-formbuilder administrative endpoints with Referer headers pointing to external, untrusted domains
- Bursts of plugin configuration writes correlated with an administrator browsing session
Detection Strategies
- Enable WordPress activity logging to track administrative changes to plugin settings and forms
- Inspect web server access logs for POST requests to pixel-formbuilder endpoints with off-site Referer or missing Origin headers
- Deploy a Web Application Firewall (WAF) rule that flags state-changing requests to the plugin lacking a valid nonce parameter
Monitoring Recommendations
- Alert on plugin configuration modifications outside standard administrative workflows or maintenance windows
- Monitor administrator email accounts for phishing lures directing users to unfamiliar URLs
- Correlate authenticated WordPress sessions with outbound browsing telemetry to identify suspicious cross-site interactions
How to Mitigate CVE-2025-31915
Immediate Actions Required
- Update the Pixel WordPress Form Builder Plugin & Autoresponder to a version later than 1.0.3 once released by the vendor
- Deactivate and remove the pixel-formbuilder plugin if a patched version is not yet available and the plugin is not business-critical
- Restrict administrative access to WordPress to trusted networks and enforce short session lifetimes
Patch Information
At the time of publication, the Patchstack advisory reports the issue affects all versions up to and including 1.0.3. Site administrators should monitor the plugin's WordPress.org listing for a fixed release and apply the update immediately when available.
Workarounds
- Deploy a WAF policy that enforces same-origin Referer and Origin header checks on requests targeting the plugin's admin endpoints
- Require administrators to log out of WordPress before browsing untrusted sites, and use separate browser profiles for administrative work
- Implement SameSite=Strict or SameSite=Lax attributes on WordPress authentication cookies to limit cross-site cookie transmission
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
