CVE-2026-102374mediumCWE-79

CVE-2026-102374: medium-severity vulnerability in GestSup

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

Published · Updated

33Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 5.3epss 0.2%
exploitation probability
0.2%top 90% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Affected products
GestSup · GestSup
public PoCs found — 1
cve_referenceblog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/unverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — GestSup

In the same product, most dangerous first.

CVE-2026-100389CRITICALGestSup before 3.2.62 Remote Code Execution via IMAP AttachmentEPSS 0.6%CVE-2026-22197HIGHGestSup < 3.2.60 Multiple SQL Injections in Asset ListEPSS 0.3%CVE-2026-22196HIGHGestSup < 3.2.60 SQL Injection in Ticket CreationEPSS 0.3%CVE-2026-22195HIGHGestSup < 3.2.60 SQL Injection in Search BarEPSS 0.3%CVE-2026-22198MEDIUMGestSup < 3.2.60 Stored XSS in API Error LogsEPSS 0.3%CVE-2026-102373HIGHGestSup before 3.2.62 Private Ticket Comment Disclosure via threadedit ParameterEPSS 0.2%
References
https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/https://gestsup.fr/index.php?page=changeloghttps://gestsup.fr/index.php?page=downloadhttps://gestsup.fr/index.php?page=download&channel=stable&version=3.2.62&type=patchhttps://www.vulncheck.com/advisories/gestsup-before-3.2.62-stored-xss-via-double-decoded-email-subject-in-oauth-imap-connector