Vulnerability · Published Apr 20, 2026 · Assigned by VulnCheck

CVE-2026-23758GFI HelpDesk < 4.99.9 Stored XSS via editsubject Parameter

Medium 5.1

In plain English

A medium-severity cross-site scripting in HelpDesk from GFI Software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.2%top 95.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

GFI HelpDesk before 4.99.9 contains a stored cross-site scripting vulnerability in the ticket subject field that allows authenticated staff members to inject malicious JavaScript by manipulating the editsubject POST parameter. Attackers can inject XSS payloads through inadequate sanitization in Controller_Ticket.EditSubmit() that bypass the incomplete SanitizeForXSS() method to execute arbitrary JavaScript when other staff members or administrators view the affected ticket.

Affected products (as reported)

Vendor	Product	Versions
GFI Software	HelpDesk	0 – before 4.99.9

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References

https://gfi.ai/products-and-solutions/email-and-messaging-solutions/helpdesk/resources/product-releases vendor-advisory, patch
https://www.vulncheck.com/advisories/gfi-helpdesk-stored-xss-via-editsubject-parameter third-party-advisory