CVE-2026-23758 GFI HelpDesk < 4.99.9 Stored XSS via editsubject Parameter
Authenticated staff can inject malicious JavaScript via the ticket subject field, leading to arbitrary code execution when viewed by other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-23758?
CVE-2026-23758 is a medium-severity cross-site scripting vulnerability in GFI Software HelpDesk, published on 20 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-23758?
It affects 1 product.
Products include Gfi Helpdesk.
How do I fix CVE-2026-23758?
No fix has been published for CVE-2026-23758 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-23758 being exploited?
There is no known exploitation of CVE-2026-23758 in the wild and no public exploit code.
Other vulnerabilities in GFI Software HelpDesk
Sources
Also known as GHSA-rf6c-2qc7-c945.