CVE-2025-43835 Overview
CVE-2025-43835 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the wp-cyr-cho WordPress plugin developed by ktsvetkov. The flaw impacts all plugin versions up to and including 0.1. An attacker can craft a malicious web page that, when visited by an authenticated WordPress user, triggers unintended state-changing actions in the plugin. The vulnerability is categorized under CWE-352 and requires user interaction to succeed. Exploitation targets the integrity of plugin configuration or data rather than confidentiality or availability.
Critical Impact
Authenticated WordPress users can be tricked into performing unauthorized actions on the wp-cyr-cho plugin, resulting in low-level integrity impact on site configuration.
Affected Products
- ktsvetkov wp-cyr-cho WordPress plugin versions n/a through 0.1
- WordPress sites with the vulnerable plugin installed and active
- Administrator or privileged accounts whose sessions can be leveraged for CSRF
Discovery Timeline
- 2025-05-19 - CVE-2025-43835 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-43835
Vulnerability Analysis
The wp-cyr-cho plugin fails to validate the origin or authenticity of requests submitted to its state-changing endpoints. WordPress plugins typically defend against CSRF by requiring a nonce token verified via wp_verify_nonce() or check_admin_referer(). The plugin either omits these checks or implements them insufficiently. An attacker exploits this by hosting a crafted HTML page or link that issues a forged request. When an authenticated WordPress user visits the page, the browser automatically attaches their session cookies to the outbound request, causing the target site to process it as legitimate.
Root Cause
The root cause is missing or improper CSRF token validation on plugin request handlers, as defined in CWE-352. The plugin does not enforce a per-request unpredictable token bound to the user session before executing privileged operations.
Attack Vector
Exploitation is network-based and requires user interaction. An attacker must lure an authenticated WordPress user, typically an administrator, to a malicious URL or embedded resource. Attack complexity is low, and no prior authentication or privileges are needed by the attacker. Successful exploitation results in low integrity impact, such as unauthorized modification of plugin settings, with no direct confidentiality or availability consequences. The EPSS score is 0.128%, indicating a low probability of observed exploitation in the near term.
No verified exploit code or public proof of concept is available at this time. See the Patchstack WordPress Vulnerability advisory for additional context.
Detection Methods for CVE-2025-43835
Indicators of Compromise
- Unexpected changes to wp-cyr-cho plugin settings without corresponding administrator activity in audit logs
- Referer headers in WordPress access logs pointing to external, untrusted domains for plugin admin endpoints
- POST requests to plugin admin handlers lacking a valid WordPress nonce parameter
Detection Strategies
- Inspect WordPress access logs for state-changing requests to wp-admin endpoints associated with wp-cyr-cho that originate from off-site referrers
- Enable WordPress activity logging plugins to capture configuration changes with user, IP, and referer metadata
- Compare plugin configuration snapshots over time to identify unauthorized modifications
Monitoring Recommendations
- Monitor administrator browser sessions and warn users about visiting untrusted links while logged in
- Alert on HTTP requests to plugin endpoints that lack the expected _wpnonce parameter
- Track installations of the wp-cyr-cho plugin across managed WordPress environments to identify exposure
How to Mitigate CVE-2025-43835
Immediate Actions Required
- Deactivate and remove the wp-cyr-cho plugin until a patched release is verified as available
- Audit administrator accounts and recent plugin configuration changes for signs of unauthorized modification
- Require administrators to log out of WordPress sessions when not actively managing the site
Patch Information
At the time of publication, the vendor advisory lists the vulnerability as affecting all versions through 0.1 with no fixed version identified. Consult the Patchstack advisory for the latest patch status and monitor the WordPress plugin repository for updated releases.
Workarounds
- Remove the plugin from production WordPress sites and replace with a maintained alternative
- Deploy a web application firewall (WAF) rule to block requests to plugin endpoints that lack a valid _wpnonce parameter or arrive with an external referer
- Restrict administrator access to a dedicated browser profile that does not visit untrusted sites
- Enforce short WordPress session lifetimes and require reauthentication for privileged actions
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
