XSS in Gfi Helpdesk
CVE-2026-23758
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (3.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Gfi Helpdesk
- Gfi Software Helpdesk — versions 0
Weakness classification (CWE)
References
- gfi.ai/products-and-solutions/email-and-messaging-solutions/helpdesk/resources/… (vendor-advisory, Release Notes, patch)
- www.vulncheck.com/advisories/gfi-helpdesk-stored-xss-via-editsubject-parameter (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-23758?
- CVE-2026-23758 is a medium-severity vulnerability in Gfi Helpdesk, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-20.
- How severe is CVE-2026-23758?
- Medium severity. CVSS v3 base score is 5.4 out of 10.