CVE-2026-102374

MEDIUM 6.1

GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	gestsup
Product	gestsup
Published	Sep 29, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

GestSup / GestSup

0 < 3.2.62

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gestsup.fr: https://gestsup.fr/index.php?page=changelog gestsup.fr: https://gestsup.fr/index.php?page=download gestsup.fr: https://gestsup.fr/index.php?page=download&channel=stable&version=3.2.62&type=patch vulncheck.com: https://www.vulncheck.com/advisories/gestsup-before-3.2.62-stored-xss-via-double-decoded-email-subject-in-oauth-imap-connector

Credits

SpiizN