Vulnerability · Published Sep 29, 2026 · Assigned by VulnCheck
CVE-2026-102374GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector
Medium 6.1
In plain English
A medium-severity cross-site scripting in GestSup from GestSup. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 88.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://gestsup.fr/index.php?page=changelog release-notes
- https://gestsup.fr/index.php?page=download product
- https://gestsup.fr/index.php?page=download&channel=stable&version=3.2.62&type=patch patch
- VulnCheck Advisory: GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector third-party-advisory
- https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/ technical-description, exploit