Advisory Details

February 19th, 2026

Fortinet FortiClient VPN FCConfig Utility Link Following Local Privilege Escalation Vulnerability

ZDI-26-115
ZDI-CAN-25710

CVE ID CVE-2025-62676
CVSS SCORE 7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Fortinet
AFFECTED PRODUCTS FortiClient VPN
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Fortinet FortiClient VPN. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the FortiClient Configuration Daemon. By creating a junction, an attacker can abuse the service to overwrite arbitrary files. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

ADDITIONAL DETAILS Fortinet has issued an update to correct this vulnerability. More details can be found at:
https://fortiguard.fortinet.com/psirt/FG-IR-25-661
DISCLOSURE TIMELINE
  • 2025-05-29 - Vulnerability reported to vendor
  • 2026-02-19 - Coordinated public release of advisory
  • 2026-02-19 - Advisory Updated
CREDIT Alexander Staalgaard
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