CVE-2025-53265: Virusdie Plugin CSRF Vulnerability

CVE-2025-53265 Overview

CVE-2025-53265 is a Cross-Site Request Forgery (CSRF) vulnerability [CWE-352] affecting the Virusdie WordPress plugin through version 1.1.3. The flaw allows an attacker to trick an authenticated user into submitting unwanted requests to the plugin, executing state-changing actions without consent. Exploitation requires user interaction, such as visiting a malicious page while authenticated to the target WordPress site. Successful exploitation can result in limited integrity and availability impact within the plugin's scope. Patchstack published the advisory tracking this issue in the WordPress ecosystem.

Critical Impact
An attacker can forge authenticated requests to the Virusdie plugin, causing unauthorized changes when a logged-in administrator visits a malicious page.

Affected Products

Virusdie WordPress Plugin versions up to and including 1.1.3
WordPress installations with the Virusdie plugin enabled
Sites relying on Virusdie for malware scanning and cleanup

Discovery Timeline

2025-06-27 - CVE-2025-53265 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-53265

Vulnerability Analysis

The vulnerability stems from missing or insufficient CSRF token validation in the Virusdie plugin's request handlers. WordPress provides nonce-based protection through functions like wp_nonce_field() and check_admin_referer(), but the affected plugin endpoints do not properly verify these tokens. As a result, the plugin cannot distinguish between a legitimate action initiated by the user and a forged request issued by an attacker-controlled page.

Exploitation requires an authenticated WordPress user, typically an administrator, to visit a page controlled by the attacker. That page silently submits a crafted request to the vulnerable plugin endpoint using the victim's browser session. The victim's authentication cookies accompany the request, and the server processes it as legitimate.

The attack vector is network-based with low complexity, no privileges required on the attacker side, and mandatory user interaction. Impact is limited to low integrity and low availability effects within the plugin's scope. Confidentiality is not directly affected.

Root Cause

The root cause is the absence of anti-CSRF token verification on state-changing HTTP requests handled by the Virusdie plugin. Without validating a nonce or equivalent unpredictable value, the plugin trusts any authenticated request that reaches its endpoints.

Attack Vector

An attacker hosts a malicious HTML page containing an auto-submitting form or JavaScript that targets a Virusdie plugin action URL. When an authenticated WordPress user with sufficient privileges loads the page, the browser sends the forged request along with valid session cookies. The plugin performs the requested action as if the user had initiated it. Delivery typically occurs through phishing links, malicious advertisements, or compromised third-party content.

No verified proof-of-concept code is publicly available. Refer to the Patchstack Vulnerability Advisory for additional technical context.

Detection Methods for CVE-2025-53265

Indicators of Compromise

Unexpected POST or GET requests to Virusdie plugin endpoints originating from external Referer headers
WordPress audit log entries showing plugin configuration changes without a corresponding administrator action
Requests to plugin action URLs lacking the expected _wpnonce parameter
Outbound requests from user browsers to attacker-controlled domains preceding suspicious plugin activity

Detection Strategies

Inspect web server access logs for requests to Virusdie plugin paths with off-site Referer headers or absent nonce parameters
Enable WordPress activity logging plugins to record administrative actions tied to Virusdie
Correlate browser session activity with plugin state changes to identify forged requests
Deploy a web application firewall (WAF) rule to flag cross-origin submissions to wp-admin endpoints associated with the plugin

Monitoring Recommendations

Alert on authenticated WordPress requests where the Origin or Referer header does not match the site domain
Monitor for repeated plugin action calls following user visits to external links, especially by administrator accounts
Track installations of Virusdie at version 1.1.3 or earlier across managed WordPress fleets
Review file integrity of the plugin directory for unauthorized modifications

How to Mitigate CVE-2025-53265

Immediate Actions Required

Update the Virusdie plugin to a version later than 1.1.3 once a fixed release is published by the vendor
Deactivate the Virusdie plugin on WordPress sites if a patched version is not yet available
Restrict administrative access to trusted networks and require re-authentication for sensitive actions
Educate administrators to avoid clicking untrusted links while logged into WordPress

Patch Information

At the time of publication, refer to the Patchstack Vulnerability Advisory for the latest patch status. Apply the vendor-supplied update as soon as it becomes available through the WordPress plugin repository.

Workarounds

Disable the Virusdie plugin until a fixed version is released
Deploy a WAF policy that blocks cross-origin state-changing requests to wp-admin/admin-ajax.php and wp-admin/admin-post.php targeting Virusdie actions
Enforce SameSite cookie attributes and require step-up authentication for administrative operations
Limit administrator accounts and use separate browser profiles for WordPress administration

bash

# Example WAF rule concept: block cross-origin POSTs to WordPress admin endpoints
# lacking a same-origin Referer header
SecRule REQUEST_METHOD "@streq POST" \
  "chain,phase:2,deny,status:403,id:1005325,\
   msg:'Potential CSRF against WordPress admin endpoint'"
SecRule REQUEST_URI "@rx /wp-admin/(admin-ajax|admin-post)\.php" "chain"
SecRule REQUEST_HEADERS:Referer "!@beginsWith https://example.com/"