CVE-2026-102374

Medium

Description

GestSup versions before 3.2.62 contain a stored cross-site scripting vulnerability in the IMAP OAuth connector that double-decodes MIME-encoded email subjects after HTML escaping. Unauthenticated attackers can send crafted emails to monitored mailboxes with nested MIME encoded-words to inject JavaScript that executes in technician sessions when viewing tickets.

SeverityMedium

CVSS6.1

Exploit probability—

ProductGestSup

PublishedSep 29, 2026

First seenSep 29, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

GestSup GestSup3.2.62 or later

Patches

gestsup.fr/index.php?page=download&channel=stable&version=3.2.62&type=patch

Vendor advisories

gestsup.fr/index.php?page=changelog

Affected products

Product	Affected versions	Fixed in
GestSup GestSup	v < 3.2.62	3.2.62

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