How severe is CVE-2026-59841?

CVE-2026-59841 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-59841 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-59841?

CVE-2026-59841 affects Fortinet Fortisiem. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-59841?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-59841 published?

CVE-2026-59841 was published on 2026-07-14 and last updated on 2026-07-15.

CVE-2026-59841

CVE-2026-59841 is a high-severity vulnerability in Fortinet Fortisiem with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-923.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-923
Affected product: Fortinet Fortisiem
Published: 2026-07-14
Last modified: 2026-07-15

Description

A improper restriction of communication channel to intended endpoints vulnerability in Fortinet FortiSIEMWindowsAgent 7.4.0 through 7.4.1 may allow attacker to escalation of privilege via <insert attack vector here>

Frequently asked questions

What is CVE-2026-59841?: A improper restriction of communication channel to intended endpoints vulnerability in Fortinet FortiSIEMWindowsAgent 7.4.0 through 7.4.1 may allow attacker to escalation of privilege via <insert attack vector here>
How severe is CVE-2026-59841?: CVE-2026-59841 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-59841 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-59841?: CVE-2026-59841 affects Fortinet Fortisiem. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-59841?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-59841 published?: CVE-2026-59841 was published on 2026-07-14 and last updated on 2026-07-15.

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-155

Affected products (1)

cpe:2.3:a:fortinet:fortisiem:*:*:*:*:*:*:*:*

More vulnerabilities in Fortinet Fortisiem

CVE-2024-23109 — Critical (CVSS 10.0): An improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet…
CVE-2024-23108 — Critical (CVSS 10.0): An improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet…
CVE-2023-34992 — Critical (CVSS 10.0): A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet…
CVE-2023-40714 — Critical (CVSS 9.9): A relative path traversal in Fortinet FortiSIEM versions 7.0.0, 6.7.0 through 6.7.2, 6.6.0 through 6.6.3, 6.5.1, 6.5.0…
CVE-2025-64155 — Critical (CVSS 9.8): An improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet…
CVE-2025-25256 — Critical (CVSS 9.8): An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78]…

All CVEs affecting Fortinet Fortisiem →

Other CWE-923 vulnerabilities

CVE-2019-17440 — Critical (CVSS 10.0): Improper restriction of communications to Log Forwarding Card (LFC) on PA-7000 Series devices with second-generation…
CVE-2024-41889 — Critical (CVSS 9.8): Multiple Pimax products accept WebSocket connections from unintended endpoints. If this vulnerability is exploited,…
CVE-2026-34205 — Critical (CVSS 9.6): Home Assistant is open source home automation software that puts local control and privacy first. Home Assistant apps…
CVE-2023-28078 — Critical (CVSS 9.1): Dell OS10 Networking Switches running 10.5.2.x and above contain a vulnerability with zeroMQ when VLT is configured. A…
CVE-2025-61939 — High (CVSS 8.8): An unused function in MicroServer can start a reverse SSH connection to a vendor registered domain, without mutual…
CVE-2025-20261 — High (CVSS 8.8): A vulnerability in the SSH connection handling of Cisco Integrated Management Controller (IMC) for Cisco UCS B-Series,…

Browse all CWE-923 vulnerabilities →