CVE-2026-1377: imwptip WordPress Plugin CSRF Vulnerability

CVE-2026-1377 Overview

The imwptip plugin for WordPress contains a Cross-Site Request Forgery (CSRF) vulnerability affecting all versions up to and including 1.1. This security flaw stems from missing nonce validation on the settings update functionality, which allows unauthenticated attackers to modify the plugin's configuration through forged requests when they successfully trick a site administrator into clicking a malicious link.

Critical Impact

Unauthenticated attackers can manipulate plugin settings by exploiting the missing CSRF protection, potentially leading to unauthorized configuration changes on vulnerable WordPress sites.

Affected Products

• WordPress imwptip plugin versions up to and including 1.1
• WordPress installations with the vulnerable imwptip plugin active

Discovery Timeline

• 2026-01-28 - CVE-2026-1377 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2026-1377

Vulnerability Analysis

This vulnerability is classified as CWE-352 (Cross-Site Request Forgery). The imwptip WordPress plugin fails to implement proper nonce validation when processing settings update requests. WordPress nonces are security tokens designed to protect URLs and forms from misuse by verifying that the request originated from the current site and was intentional.

Without nonce validation, the plugin cannot distinguish between legitimate settings updates initiated by authenticated administrators and malicious requests crafted by attackers. This allows attackers to create specially crafted web pages or links that, when accessed by an authenticated administrator, will automatically submit settings changes to the vulnerable plugin without the administrator's knowledge or consent.

The impact is limited to integrity modifications (unauthorized settings changes) without direct confidentiality impact or denial of service. However, depending on the plugin's functionality, settings manipulation could lead to secondary security issues.

Root Cause

The root cause of this vulnerability is the absence of nonce verification in the imwptipadmin.php file within the plugin's settings update handler. According to WordPress security best practices, all form submissions and AJAX requests that modify data should include and verify a nonce token using functions like wp_nonce_field() for form generation and wp_verify_nonce() or check_admin_referer() for validation.

The vulnerable code in the imwptipadmin.php file at line 11 processes settings updates without first verifying the presence and validity of a WordPress nonce, leaving the functionality exposed to cross-site request forgery attacks.

Attack Vector

The attack requires user interaction and follows a network-based attack vector. An attacker would craft a malicious HTML page containing a form that submits a POST request to the vulnerable settings update endpoint with the attacker's desired configuration values.

The exploitation scenario involves:

1. Attacker identifies a WordPress site using the vulnerable imwptip plugin version
2. Attacker creates a malicious web page with an auto-submitting form targeting the plugin's settings endpoint
3. Attacker tricks an authenticated site administrator into visiting the malicious page (via phishing, social engineering, or embedding in a compromised site)
4. When the administrator's browser loads the page, the form automatically submits, changing the plugin settings using the administrator's active session

The vulnerability mechanism centers on the lack of nonce token verification. WordPress nonces are typically generated with wp_create_nonce() and validated with wp_verify_nonce(). For additional technical details, refer to the WordPress Plugin Code Review in the WordPress plugin repository.

Detection Methods for CVE-2026-1377

Indicators of Compromise

• Unexpected changes to imwptip plugin settings without administrator action
• HTTP POST requests to imwptip settings endpoints originating from external referrers
• Web server logs showing settings update requests with missing or invalid nonce parameters
• Administrator reports of plugin configuration changes they did not make

Detection Strategies

• Monitor WordPress admin AJAX and settings endpoints for requests lacking valid nonce tokens
• Implement Web Application Firewall (WAF) rules to detect CSRF attack patterns targeting WordPress plugins
• Review server access logs for suspicious referrer headers on administrative plugin endpoints
• Enable WordPress audit logging to track all plugin settings modifications

Monitoring Recommendations

• Configure alerting for plugin configuration changes in WordPress audit logs
• Monitor for unusual patterns of administrative requests, particularly those with external or missing referrers
• Implement real-time log analysis to detect potential CSRF exploitation attempts
• Review administrator activity logs regularly for unauthorized settings modifications

How to Mitigate CVE-2026-1377

Immediate Actions Required

• Update the imwptip plugin to a patched version when available from the plugin developer
• Consider temporarily deactivating the imwptip plugin if it is not critical to site operations
• Implement additional CSRF protection at the WAF or server level
• Educate site administrators about phishing and social engineering risks

Patch Information

The vulnerability affects imwptip plugin versions up to and including 1.1. Site administrators should check the Wordfence Vulnerability Report for the latest patch availability and update information. Monitor the WordPress plugin repository for updated versions that include proper nonce validation.

Workarounds

• Restrict access to WordPress admin panel to trusted IP addresses only
• Implement Content Security Policy headers to mitigate cross-origin request risks
• Use browser extensions that block automatic form submissions from untrusted sources
• Ensure administrators use separate browser sessions for administrative tasks and general browsing

# Example: Restrict WordPress admin access by IP in .htaccess
<Files wp-admin>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>