CVE-2026-59838
CVSSv3 Score: 5.3 An Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability [CWE-80] in FortiSIEM may allow a privileged administrator to execute unauthorized commands via crafted requests. Revised on 2026-07-14 00:00:00
CSIRTS triage
- What
- A privileged administrator may execute unauthorized commands via crafted requests.
- Who is affected
- Privileged administrators using FortiSIEM.
- Urgency
- Remediation is important due to the potential for unauthorized command execution.
- Action
- Update FortiSIEM to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
Advisory coverage (4)
- medium[NEW] [medium] Fortinet FortiSIEM: Multiple vulnerabilitiescert-bund · 2026-07-16
- mediumCVE-2026-59838: A improper neutralization of script-related html tags in a web page (basic xss) vulnerability …nvd · 2026-07-15
- unknownMultiple vulnerabilities in Fortinet products (July 15, 2026)cert-fr-avis · 2026-07-15
- unknownCross-Site Scripting in Domain parameterfortinet · 2026-07-14
External references
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[](https://www.csirts.com/cve/CVE-2026-59838)