CVE-2026-102374

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.

CVSS Vector

References

• https://gestsup.fr/index.php?page=changelog
• https://gestsup.fr/index.php?page=download
• https://gestsup.fr/index.php?page=download&channel=stable&version=3.2.62&type=patch
• https://www.vulncheck.com/advisories/gestsup-before-3.2.62-stored-xss-via-double-decoded-email-subject-in-oauth-imap-connector