CVE-2026-102374
GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector
GestSup GestSup
CVSS
5.3MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 10% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 3.2.62GestSupCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 1
- GestSupaffected: all versions before 3.2.62CVE List
References 5
- gestsup.fr/index.php?page=changelogFixvia CVE List
- gestsup.fr/index.php?page=download&channel=stable&version=3.2.62&type=patchFixvia CVE List
- vulncheck.com/advisories/gestsup-before-3.2.62-stored-xss-via-double-decoded-email-subject-in-oauth-imap-connectorAdvisoryvia CVE List
- blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/Exploitvia CVE List
- gestsup.fr/index.php?page=downloadReferencevia CVE List