CVE-2026-6177: XSS in Custom Twitter Feeds WordPress Plugin

An attacker exploiting this XSS vulnerability can execute arbitrary JavaScript code in the context of a victim's browser. This can lead to various malicious outcomes, including session hijacking, defacement of the WordPress site, redirection to phishing pages, and theft of sensitive user data. The ctfgetmore_posts AJAX action, accessible to unauthenticated users, directly outputs cached tweet data without proper HTML escaping, making it a prime target for injection. The attacker's ability to inject malicious content hinges on their ability to influence the cached tweet data, either through crafted tweets or exploiting other vulnerabilities within the plugin or WordPress itself. This vulnerability shares similarities with other XSS flaws where insufficient output encoding allows for the execution of attacker-controlled scripts.

1. Gereserveerd2026-04-13
2. Gepubliceerd2026-05-12
3. Gewijzigd2026-05-13
4. EPSS bijgewerkt2026-05-15

The primary mitigation for CVE-2026-6177 is to immediately upgrade the Custom Twitter Feeds plugin to version 2.5.5 or later. If upgrading is not immediately feasible, consider implementing a Web Application Firewall (WAF) rule to filter potentially malicious input in the ctfgetmore_posts AJAX action. Specifically, look for patterns indicative of JavaScript code within the tweet content. As a temporary workaround, disabling the caching of tweets within the plugin might reduce the attack surface, but this will likely impact performance. After upgrading, confirm the fix by attempting to inject a simple JavaScript payload (e.g., <script>alert('XSS')</script>) into a tweet and verifying that it is not executed.