CVE-2026-23756 GFI HelpDesk < 4.99.9 Stored XSS via Troubleshooter Step Subject
An authenticated staff member can inject arbitrary JavaScript into the Troubleshooter step subject, leading to stored XSS 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-2026-23756?
CVE-2026-23756 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 Troubleshooter module where the subject POST parameter is not sanitized in Controller_Step.InsertSubmit() and EditSubmit() before being rendered by View_Step.RenderViewSteps(). An authenticated staff member can inject arbitrary JavaScript into the step subject field, and the payload executes when any user navigates to Troubleshooter > View Troubleshooter and clicks the affected step link.
Weakness: CWE-79
Which versions are affected by CVE-2026-23756?
It affects 1 product.
Products include Gfi Helpdesk.
How do I fix CVE-2026-23756?
No fix has been published for CVE-2026-23756 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-2026-23756 being exploited?
There is no known exploitation of CVE-2026-23756 in the wild and no public exploit code.
Other vulnerabilities in GFI Software HelpDesk
Sources
Also known as GHSA-99wh-5v8j-65hf.