Medium severity · published Sep 29, 2026
CVE-2026-102374
GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector
6.1
CVSS
0.2%
EPSS
No
On KEV
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
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GE
GestSup · GestSup
before 3.2.62 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102374
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102374
release-notes
https://gestsup.fr/index.php?page=changelog
product
https://gestsup.fr/index.php?page=download
patch
https://gestsup.fr/index.php?page=download&channel=stable&version=3.2.62&type=patch
third-party-advisory
https://www.vulncheck.com/advisories/gestsup-before-3.2.62-stored-xss-via-double-decoded-email-subject-in-oauth-imap-connector
technical-description
https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/
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