CVE-2025-53264 Overview
CVE-2025-53264 is a Cross-Site Request Forgery (CSRF) vulnerability in the Konrád Koller ONet Regenerate Thumbnails WordPress plugin. The flaw affects all versions up to and including 1.5. An attacker can trick an authenticated administrator into submitting a forged request that triggers plugin actions without consent. Successful exploitation requires user interaction, typically by luring the victim to a malicious page. The issue is tracked under CWE-352 and was disclosed through Patchstack.
Critical Impact
An attacker can force an authenticated WordPress administrator to execute unwanted plugin actions, resulting in limited integrity impact on affected sites.
Affected Products
- ONet Regenerate Thumbnails WordPress plugin (onet-regenerate-thumbnails)
- All versions from n/a through 1.5
- WordPress installations using the vulnerable plugin
Discovery Timeline
- 2025-06-27 - CVE-2025-53264 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-53264
Vulnerability Analysis
The vulnerability stems from missing or insufficient CSRF protection in the ONet Regenerate Thumbnails plugin. The plugin does not properly validate the origin or authenticity of state-changing requests. WordPress typically enforces CSRF protection through nonces generated by wp_create_nonce() and verified with check_admin_referer() or wp_verify_nonce(). The affected plugin lacks proper enforcement of these controls on privileged actions.
An attacker crafts a malicious web page containing a request targeting the plugin's action endpoint. When an authenticated administrator visits the page, the browser automatically includes session cookies, causing the plugin to process the forged request as legitimate.
Root Cause
The root cause is missing anti-CSRF token verification on plugin action handlers. Without nonce validation, the plugin cannot distinguish between requests initiated by the administrator through the WordPress dashboard and requests forged by external sites.
Attack Vector
Exploitation requires network access and user interaction. The attacker must convince an authenticated administrator to click a link or visit a page hosting the forged request. No privileges are required by the attacker, but the victim must hold an active WordPress session with sufficient permissions to trigger the thumbnail regeneration functionality. See the Patchstack CSRF Vulnerability Report for additional technical details.
Detection Methods for CVE-2025-53264
Indicators of Compromise
- Unexpected thumbnail regeneration activity in WordPress logs without corresponding administrator dashboard sessions
- HTTP Referer headers pointing to external, untrusted domains on requests to the plugin's action endpoints
- Repeated POST requests to plugin URLs originating from a single external referrer
Detection Strategies
- Monitor WordPress access logs for requests to onet-regenerate-thumbnails endpoints where the Referer header does not match the site's own domain
- Correlate authenticated administrator sessions with plugin action requests to identify anomalous timing
- Deploy a Web Application Firewall (WAF) with CSRF detection rules for WordPress admin actions
Monitoring Recommendations
- Enable WordPress audit logging plugins to capture administrator actions and their originating context
- Review server-side logs for suspicious cross-origin requests targeting /wp-admin/ endpoints
- Track user-agent and IP anomalies on high-privilege account activity
How to Mitigate CVE-2025-53264
Immediate Actions Required
- Deactivate the ONet Regenerate Thumbnails plugin until a patched version is available
- Restrict administrator browsing habits and enforce dedicated browsers or profiles for WordPress administration
- Apply a WAF rule set that validates request origin for state-changing WordPress plugin actions
Patch Information
At the time of publication, no fixed version has been identified beyond 1.5. Administrators should monitor the Patchstack advisory and the plugin's repository for updates.
Workarounds
- Uninstall the plugin and use an actively maintained alternative for thumbnail regeneration
- Enforce SameSite=Strict cookie attributes on WordPress session cookies to limit cross-site request risk
- Require re-authentication for administrative actions using plugins that enforce nonce validation site-wide
- Segment administrator accounts and avoid browsing untrusted sites during active WordPress sessions
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
