Home/CVE/A improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Fortinet FortiSa
CVE

CVE-2026-39812

A improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Fortinet FortiSa

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>.

MEDIUM · CVSS 4.8 EPSS 0.00035
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
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Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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Affected Products & Versions

6
fortinet fortisandbox>= 4.2.0 and <= 4.2.8
fortinet fortisandbox>= 4.4.0 and < 4.4.9
fortinet fortisandbox>= 5.0.0 and < 5.0.6
fortinet fortisandbox cloud>= 22.2.4134 and <= 23.1.4260
fortinet fortisandbox cloud>= 23.3.4329 and <= 24.1.4436
fortinet fortisandbox cloudall versions
▣

Scoring & Timeline

4.8
MEDIUM · CVSS v3.1 · psirt@fortinet.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Apr 2026 · 04:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://fortiguard.fortinet.com/psirt/FG-IR-26-110Vendor Advisory
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