CVE-2026-84772

Improper Control of Generation of Code ('Code Injection') vulnerability in WPMU DEV Broken Link Checker broken-link-checker allows Code Injection.This issue affects Broken Link Checker: from n/a through 2.4.14.1.

The Broken Link Checker plugin for WordPress in versions up to and including 2.4.14.1 is vulnerable to arbitrary shortcode execution because it does not properly validate a value before running do_shortcode. Unauthenticated attackers can execute arbitrary shortcodes if a submitted comment containing the payload in an href or src attribute is approved through the normal comment moderation workflow; once approved, the shortcode executes automatically via WP-Cron.

The Broken Link Checker plugin for WordPress up to version 2.4.13 is vulnerable to Stored Cross-Site Scripting via Comment Author URL / Link Log due to insufficient input sanitization and output escaping. Unauthenticated attackers can inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires an administrator to perform the plugin's standard dismiss-and-recheck workflow on a link submitted by the attacker via the WordPress comment author URL field, after which the attacker's HTTP server issues a redirect to a URL containing an HTML/JavaScript payload that is stored verbatim in the link log.

The Broken Link Checker plugin by WPMU DEV up to version 2.4.7 inclusive is vulnerable to Blind SQL Injection due to improper neutralization of special elements used in an SQL command.