Second-Order OS Command Injection via JSON Input on start vnc feature
CVSSv3 Score: 9.1 An improper neutralization of special elements used in an OS command vulnerability [CWE-78] in FortiSandbox, FortiSandbox Cloud and FortiSandbox PaaS WEB UI may allow an unauthenticated attacker to execute unauthorized commands via specifically crafted HTTP requests. Revised on 2026-06-09 00:00:00
CSIRTS triage
- What
- An improper neutralization of special elements used in an OS command vulnerability allows unauthenticated attackers to execute unauthorized commands.
- Who is affected
- Users of FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS WEB UI.
- Urgency
- Remediation is critical due to the high severity and potential for remote code execution.
- Action
- Apply the latest security updates from Fortinet.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://fortiguard.fortinet.com/psirt/FG-IR-26-141
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Elevated exploitation riskCVE-2026-2508923.4% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 98% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-25089 | coverage & exploitation status | NVD · CVE.org |
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