Cross-site scripting in FortiSandbox - CVE-2026-26248
Published: November 11, 2026
Vulnerability identifier: #VU165028
CSH Severity: High
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-26248
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The vulnerability exists due to improper neutralization of input during web page generation ('cross-site scripting') on start vnc endpoint. An unauthenticated attacker can perform an XSS attack via social engineering and crafted HTTP requests.
Affected software
FortiSandbox
How to mitigate CVE-2026-26248
Install update from vendor's website.
FortiSandbox - addressed in versions 4.4.9, 5.0.6