CVE-2026-102374
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.
Does this matter?
Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own.
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 4.0
- 5.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.21% probability · 11th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Source
- disclosure@vulncheck.com
EPSS moved from 0.2% on 29 September 2026 to 0.2% on 26 October 2026.
References
- https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.