CVE-2025-53451 in No External Links Plugin
Summary
by MITRE • 09/22/2025
Cross-Site Request Forgery (CSRF) vulnerability in mihdan Mihdan: No External Links allows Cross Site Request Forgery. This issue affects Mihdan: No External Links: from n/a through 5.1.4.
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Analysis
by VulDB Data Team • 09/22/2025
This cross-site request forgery vulnerability exists within the mihdan Mihdan: No External Links plugin for WordPress, specifically impacting versions ranging from the initial release through 5.1.4. The flaw represents a critical security weakness that enables attackers to perform unauthorized actions on behalf of authenticated users who visit malicious websites or click on compromised links. The vulnerability stems from the plugin's failure to implement proper anti-CSRF protection mechanisms, leaving users exposed to malicious request manipulation. This type of vulnerability falls under CWE-352, which specifically addresses Cross-Site Request Forgery issues, and aligns with ATT&CK technique T1531 for Account Access Removal and T1213 for Data from Information Repositories, as it allows unauthorized modifications to plugin configurations and potentially user data.
The technical implementation of this CSRF vulnerability occurs when the plugin processes requests without validating the presence of proper anti-CSRF tokens or origin checking mechanisms. Attackers can craft malicious web pages that, when visited by authenticated users, automatically submit requests to the vulnerable plugin's endpoints. These requests can modify plugin settings, disable external link filtering, or potentially manipulate other administrative functions within the WordPress environment. The vulnerability's impact is amplified because it affects the core functionality of link management and security filtering that users rely on for protecting their websites from malicious external references. The lack of CSRF protection tokens means that any valid request can be forged and executed without the user's knowledge or consent, making it particularly dangerous in environments where administrators frequently access potentially untrusted websites.
The operational impact of this vulnerability extends beyond simple configuration changes, as it can compromise the overall security posture of WordPress installations using this plugin. When exploited, attackers can disable security features that protect against external malicious links, potentially allowing malware distribution through compromised website content. This vulnerability also creates opportunities for more sophisticated attacks where the CSRF exploit serves as a stepping stone for additional compromise, particularly when combined with other vulnerabilities in the WordPress ecosystem. The attack surface is further expanded because the vulnerability affects a widely used plugin, making it a prime target for automated exploitation campaigns. Security researchers have noted that such vulnerabilities often remain undetected for extended periods due to the complexity of CSRF attack vectors and the difficulty in identifying legitimate vs. malicious requests within web applications.
Organizations using this plugin should immediately implement mitigations including immediate version updates to the latest available release, which typically includes proper CSRF token implementation and validation. The recommended approach involves verifying that all plugin requests include and validate anti-CSRF tokens before processing any modifications. Network-level protections such as web application firewalls can provide additional defense-in-depth measures by monitoring for suspicious request patterns that may indicate CSRF attacks. Administrators should also consider implementing multi-factor authentication for administrative accounts and conducting regular security audits of installed plugins to identify potential vulnerabilities. The vulnerability demonstrates the critical importance of implementing proper input validation and request verification mechanisms, as outlined in OWASP Top Ten Project recommendations for preventing CSRF attacks. Additionally, organizations should establish patch management procedures that ensure timely updates of all WordPress plugins and themes to address known vulnerabilities. The security community has identified that many CSRF vulnerabilities in WordPress plugins stem from insufficient validation of request origins and missing anti-CSRF token implementation, making this particular vulnerability consistent with broader patterns of insecure web application development practices that require comprehensive remediation strategies.