Cross-Site Scripting in Domain parameter

unknownCVE-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

vendor: Fortinet product: FortiSIEM Cross-site scripting

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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Details

Source: Fortinet FortiGuard PSIRT (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://fortiguard.fortinet.com/psirt/FG-IR-26-149

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-598380.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59838	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[NEW] [medium] Fortinet FortiSIEM: Multiple vulnerabilitiescert-bund
mediumCVE-2026-59838: A improper neutralization of script-related html tags in a web page (basic xss) vulnerability …nvd
unknownMultiple vulnerabilities in Fortinet products (July 15, 2026)cert-fr-avis

Recent advisories for Cross-Site Scripting in

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-67352: luci-app-https-dns-proxy contains a stored cross-site scripting vulnerability in the resolver_…nvd · 2026-08-01
mediumCVE-2026-67338: JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension …nvd · 2026-08-01
unknownCVE-2025-71404: better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (…nvd · 2026-08-01
mediumCVE-2026-18435: The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress is vulnera…nvd · 2026-08-01
mediumCVE-2026-18344: The Wp Responsive Thumbnail Slider plugin for WordPress is vulnerable to Reflected Cross-Site …nvd · 2026-08-01
mediumCVE-2026-18062: The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress is vulnera…nvd · 2026-08-01