What is CVE-2021-26089?

CVE-2021-26089 is a medium-severity vulnerability in Fortinet Forticlient, classified under Improper Link Resolution Before File Access. CVSS score: 6.7/10. Published 2021-07-12.

How severe is CVE-2021-26089?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Vulnerability in Fortinet Forticlient

CVE-2021-26089

An improper symlink following in FortiClient for Mac 6.4.3 and below may allow an non-privileged user to execute arbitrary privileged shell commands during installation phase.

Published 2021-07-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (34.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Fortinet Forticlient
Fortinet Forticlientmac — versions FortiClientMac 6.4.3 and below

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

fortiguard.com/advisory/FG-IR-21-022 (Vendor Advisory)
www.zerodayinitiative.com/advisories/ZDI-22-078/ (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-26089?: CVE-2021-26089 is a medium-severity vulnerability in Fortinet Forticlient, classified under Improper Link Resolution Before File Access. CVSS score: 6.7/10. Published 2021-07-12.
How severe is CVE-2021-26089?: Medium severity. CVSS v3 base score is 6.7 out of 10.