What is CVE-2026-84389?

CVE-2026-84389 is a low-severity vulnerability in Fortinet Fortisiem, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.1/10. Published 2026-09-08.

How severe is CVE-2026-84389?

Low severity. CVSS v3 base score is 3.1 out of 10.

Open Redirect in Fortinet Fortisiem

CVE-2026-84389

A url redirection to untrusted site ('open redirect') vulnerability in Fortinet FortiSIEM 7.5.0 through 7.5.1, FortiSIEM 7.4.1 through 7.4.2 may allow attacker to execute unauthorized code or commands via <insert attack vector here>

Vulnerability class: Open Redirect

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Fortinet Fortisiem

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

psirt@fortinet.com

Frequently asked questions

What is CVE-2026-84389?: CVE-2026-84389 is a low-severity vulnerability in Fortinet Fortisiem, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.1/10. Published 2026-09-08.
How severe is CVE-2026-84389?: Low severity. CVSS v3 base score is 3.1 out of 10.