CVE-2026-100389

High

Description

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductGestSup

PublishedSep 25, 2026

First seenSep 25, 2026

Weakness typeCWE-434Unrestricted upload of dangerous file type

How to fix

Update

GestSup GestSup3.2.62 or later

Vendor advisories

gestsup.fr/index.php?page=changelog

Affected products

Product	Affected versions	Fixed in
GestSup GestSup	v < 3.2.62	3.2.62

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.