Is CVE-2026-100389 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-100389?

CVE-2026-100389 has a CVSS v3 severity of HIGH (8.1).

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CVE-2026-100389

Description

GestSup versions before 3.2.61 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.