Proof of concept exploit for osTicket CVE-2026-22200 which abuses PHP filters to exfiltrate files through the mPDF library and can be chained to RCE via CVE-2024-2961 (CNEXT).
Deep-dive here: Horizon3.ai - Ticket to Shell: Exploiting PHP Filters and CNEXT in osTicket (CVE-2026-22200)
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