CVE-2026-59838
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
An XSS vulnerability in Fortinet FortiSIEM allows an attacker to inject malicious JavaScript code into a web page. The issue affects multiple FortiSIEM versions from 6.4 to 7.4.0.
Risk Assessment
An attacker can execute unauthorized code in the victim's browser, potentially leading to session theft, redirects, or theft of sensitive data.
Recommendation
Immediately update FortiSIEM to the latest patched version. Implement input filtering and output encoding in the application.
Other vulnerabilities in FortiSIEM
See all- CVE-2025-25256Critical
An OS Command Injection vulnerability in Fortinet FortiSIEM allows an unauthenticated attacker to execute unauthorized code or commands via crafted CLI requests. Affects multiple versions from 4.7 to 7.3.1.
- CVE-2026-70467Low
A Server-Side Request Forgery (SSRF) vulnerability in Fortinet FortiSIEM in multiple versions may allow an attacker to execute unauthorized code or commands.
Original NVD description (English source)
A improper neutralization of script-related html tags in a web page (basic xss) vulnerability in Fortinet FortiSIEM 7.4.0, FortiSIEM 7.3.0 through 7.3.4, FortiSIEM 7.2.0 through 7.2.6, FortiSIEM 7.1 all versions, FortiSIEM 7.0 all versions, FortiSIEM 6.7 all versions, FortiSIEM 6.6 all versions, FortiSIEM 6.5 all versions, FortiSIEM 6.4 all versions may allow attacker to execute unauthorized code or commands via <insert attack vector here>