CVE-2026-102374CWE-79cross-site-scripting

CVE-2026-102374

Medium · published September 29, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
10.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
5.3 · 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
EPSS
0.00211 · 10.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-29T05:16Z
References (5)
https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/ · [email protected]https://gestsup.fr/index.php?page=changelog · [email protected]https://gestsup.fr/index.php?page=download · [email protected]https://gestsup.fr/index.php?page=download&channel=stable&version=3.2.62&type=patch · [email protected]https://www.vulncheck.com/advisories/gestsup-before-3.2.62-stored-xss-via-double-decoded-email-subject-in-oauth-imap-connector · [email protected]
EPSS history
Timeline
  • 30 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 29 SEP 00:33Z
    GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector
    cvelistv5