CVE-2026-100389: Gestsup

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

GestSup versions before 3.2.62 contain a remote code execution vulnerability in the basic IMAP connector's attachment handling that fails to skip blocked file extensions. Unauthenticated attackers can send emails with PHP attachments to monitored mailboxes, which are written to the web-accessible upload/ticket directory and executed when accessed.

Affected products

• Gestsup Gestsup: before 3.2.62 (fixed in 3.2.62)

Published 2026-09-25. Last modified 2026-09-30.