CVE-2026-102374
GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 29, 2026
- Updated
- Sep 30, 2026
- Reserved
- Sep 28, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
GestSupGestSup |
|
References
- https://gestsup.fr/index.php?page=changelogrelease-notes
- https://gestsup.fr/index.php?page=downloadproduct
- https://gestsup.fr/index.php?page=download&channel=stable&version=3.2.62&type=patchpatch
- VulnCheck Advisory: GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connectorthird-party-advisory
- https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/technical-descriptionexploit
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