[NEW] [medium] Fortinet FortiSIEM: Multiple vulnerabilities

mediumCVE-2026-59838 CVE-2026-59841

An attacker can exploit multiple vulnerabilities in Fortinet FortiSIEM to conduct a Cross-Site Scripting attack or execute code.

CSIRTS triage

vendor: Fortinet product: FortiSIEM Cross-site scripting Remote code execution

What: Multiple vulnerabilities allow an attacker to conduct a Cross-Site Scripting attack or execute code.
Who is affected: Deployments of Fortinet FortiSIEM.
Urgency: Remediation is important due to the medium severity of the vulnerabilities.
Action: Update to the latest version to mitigate the vulnerabilities.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-16
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2330

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.
Low exploitation riskCVE-2026-598410.15% 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
CVE-2026-59841	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

mediumCVE-2026-59838: A improper neutralization of script-related html tags in a web page (basic xss) vulnerability …nvd
unknownNCSC-2026-0240 [1.00] [M/H] Vulnerabilities fixed in multiple Fortinet productsncsc-nl
unknownMultiple vulnerabilities in Fortinet products (July 15, 2026)cert-fr-avis
highCVE-2026-59841: A improper restriction of communication channel to intended endpoints vulnerability in Fortine…nvd
unknownCross-Site Scripting in Domain parameterfortinet
unknownSupers override fails to properly override supervisor addressfortinet

Recent advisories for Fortinet FortiSIEM

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.

mediumCVE-2026-59838: A improper neutralization of script-related html tags in a web page (basic xss) vulnerability …nvd · 2026-07-15