Erik Kraijenoord

100,000 WordPress Sites Exposed to Remote Code Execution via PHP Object Injection Vulnerability Found by Wordfence Argus in Tutor LMS

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On August 23rd, 2026, Wordfence Argus, our AI research agent specializing in complex vulnerability chains, discovered a PHP Object Injection vulnerability in Tutor LMS, a WordPress e-learning plugin active on more than 100,000 websites. This vulnerability allows any authenticated attacker with subscriber-level access to achieve remote code execution on the server by exploiting an interaction … Read more

Wordfence Argus Identifies Two Critical Unauthenticated Vulnerability Chains Leading to Remote Code Execution in The Events Calendar Plugin

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On August 21 and August 22, 2026, Wordfence Argus, created by the Wordfence Threat Intelligence team, identified two independent critical vulnerability chains in The Events Calendar, a WordPress plugin active on more than 600,000 websites. Both chains begin in the plugin’s widget-rendering pipeline and can ultimately lead to Remote Code Execution without authentication through two … Read more

Wordfence Bug Bounty Program Monthly Report – May 2026

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In May 2026, the Wordfence Bug Bounty Program received 1095 vulnerability submissions from our growing community of security researchers working to improve the overall security posture of the WordPress ecosystem. These submissions are reviewed, triaged, and processed by the Wordfence Threat Intelligence team, with validated vulnerabilities responsibly disclosed to vendors, often through the Wordfence Vulnerability … Read more