CVE-2025-5925: Bunny's Print CSS WordPress CSRF Flaw

CVE-2025-5925 Overview

CVE-2025-5925 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Bunny's Print CSS plugin for WordPress. The flaw exists in all versions up to and including 0.95 and stems from missing or incorrect nonce validation in the pcss_options_subpanel() function. Unauthenticated attackers can modify plugin settings by tricking a site administrator into clicking a malicious link or visiting a crafted page. The vulnerability is classified under CWE-352 and requires user interaction to succeed.

Critical Impact
Successful exploitation allows unauthenticated attackers to alter plugin settings on affected WordPress sites when an administrator is tricked into performing an action, potentially degrading site integrity.

Affected Products

Bunny's Print CSS plugin for WordPress
All versions up to and including 0.95
WordPress sites with the vulnerable plugin activated

Discovery Timeline

2025-06-10 - CVE-2025-5925 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-5925

Vulnerability Analysis

The vulnerability resides in the pcss_options_subpanel() function of the Bunny's Print CSS plugin. This function processes administrative settings changes but does not enforce a valid WordPress nonce token on incoming requests. Without nonce validation, the plugin cannot verify that a state-changing request originated from an authenticated administrator's own session. An attacker can craft a malicious HTML page or link containing a forged POST request that targets the plugin's settings endpoint. When an authenticated administrator visits the attacker-controlled page, the browser automatically submits the forged request using the administrator's session cookies. The plugin then processes the request as legitimate and updates its configuration.

Root Cause

The root cause is the absence of a WordPress nonce check in the settings handler. WordPress provides wp_nonce_field() and check_admin_referer() primitives to bind state-changing requests to a specific user session. The affected code path in print-css.php accepts and applies settings without invoking these validation routines, breaking the CSRF defense expected by the WordPress plugin security model.

Attack Vector

Exploitation requires an unauthenticated attacker to socially engineer a logged-in administrator into visiting a crafted URL or malicious page. The attacker hosts a page that auto-submits a form to the target site's plugin options endpoint. Because the request carries the administrator's session cookies and no nonce is required, the plugin updates its stored settings. No authentication credentials are stolen, but the attacker gains the ability to change plugin configuration remotely.

Refer to the WordPress Plugin Code Review and the Wordfence Vulnerability Report for the technical breakdown.

Detection Methods for CVE-2025-5925

Indicators of Compromise

Unexpected changes to Bunny's Print CSS plugin settings without corresponding administrator activity in audit logs
POST requests to the plugin's options handler originating from external Referer headers
Administrator sessions loading external pages immediately before plugin configuration changes

Detection Strategies

Monitor WordPress wp_options table entries associated with the Bunny's Print CSS plugin for unauthorized modifications
Inspect web server access logs for POST requests to wp-admin/admin.php or options.php referencing the plugin with cross-origin Referer values
Alert on administrator browser sessions that submit state-changing plugin requests without a preceding legitimate admin page view

Monitoring Recommendations

Enable WordPress activity logging plugins to record settings changes with user attribution and source IP
Correlate administrator authentication events with subsequent configuration changes to identify anomalous timing
Review outbound links and emails delivered to administrators for suspicious URLs targeting the WordPress admin domain

How to Mitigate CVE-2025-5925

Immediate Actions Required

Deactivate the Bunny's Print CSS plugin on any WordPress site running version 0.95 or earlier until a patched release is available
Audit recent plugin settings changes and revert any unauthorized modifications
Instruct WordPress administrators to log out of admin sessions before browsing untrusted sites or clicking unverified links

Patch Information

At the time of publication, the vendor references listed in NVD do not include a fixed release version. Administrators should monitor the Wordfence Vulnerability Report and the WordPress plugin repository for an updated version of Bunny's Print CSS that adds nonce validation to pcss_options_subpanel().

Workarounds

Remove or deactivate the plugin until a patched version ships
Restrict WordPress administrator access using IP allowlists at the web server or firewall layer
Deploy a Web Application Firewall rule that blocks POST requests to the plugin's options endpoint when the Referer header is missing or off-origin
Enforce short administrator session lifetimes and require re-authentication before sensitive operations

bash

# Example WAF rule (ModSecurity) to block cross-origin POSTs to plugin options
SecRule REQUEST_METHOD "@streq POST" \
  "chain,id:1005925,phase:2,deny,status:403,msg:'CVE-2025-5925 CSRF block'"
  SecRule REQUEST_URI "@contains print-css" "chain"
    SecRule REQUEST_HEADERS:Referer "!@beginsWith https://your-site.example/wp-admin/"