Medium severity · published Apr 14, 2026
CVE-2026-39812
A improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through…
4.8
CVSS
0.2%
EPSS
No
On KEV
Description
A improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox PaaS 5.0.0 through 5.0.5, FortiSandbox PaaS 4.4.0 through 4.4.8, FortiSandbox PaaS 4.2 all versions may allow attacker to execute unauthorized code or commands via <insert attack vector here>
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
FortiSandbox · Fortinet
5.0.0 through 5.0.4; 4.4.0 through 4.4.8; 4.2.1 through 4.2.8 · source: vendor, NVD
FP
FortiSandbox PaaS · Fortinet
5.0.0 through 5.0.5; 4.4.0 through 4.4.8; 4.2.1 through 4.2.8 · source: vendor
FC
Fortisandbox Cloud · Fortinet
22.2.4134 through 23.1.4260; 23.3.4329 through 24.1.4436; 5.0.4; 5.0.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-39812
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-39812
Vendor Advisory
https://fortiguard.fortinet.com/psirt/FG-IR-26-110
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