SB2026021044 - Firewall policy bypass in FortiOS FSSO Terminal Services Agent
Published: February 10, 2026
Security Bulletin ID
SB2026021044
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper verification of source of a communication channel (CVE-ID: CVE-2025-62439)
The vulnerability allows a remote user to gain unauthorized access to protected network.
The vulnerability exists due to firewall policy bypass in FSSO Terminal Services Agent. A remote authenticated user with knowledge of FSSO policy configurations can gain unauthorized access to protected network resources via crafted requests.
Remediation
Install update from vendor's website.