CVE-2026-59835: Fortinet Unauthenticated VNC access exposed on all interfaces
This Fortinet advisory covers CVE-2026-59835 in FortiSandbox.
- CVE-2026-59835
Key facts
- Vendor rating
- High, CVSS 8.6
- CISA KEV
- Not listed (catalogue checked )
- Affected
- FortiSandbox: 4.4.3 through 5.0.2 (vendor-listed versions)
- Fixed in
- FortiSandbox 5.0: 5.0.3, FortiSandbox 4.4: 4.4.9
- Advisory id
- FG-IR-26-145
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
CVSSv3 Score:
8.6
An Exposure of Resource to Wrong Sphere vulnerability [CWE-668] in FortiSandbox may allow an unauthenticated attacker to access the VNC server of VMs performing scanning via network requests.
Revised on 2026-07-14 00:00:00
Text from the source record.
- FortiSandbox: 4.4.3 through 5.0.2 (vendor-listed versions)
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-59835
Upgrade to a fixed release named by Fortinet:
- FortiSandbox 5.0: 5.0.3
- FortiSandbox 4.4: 4.4.9
Vendor guidance
- Upgrade per the Affected/Solution table: FortiSandbox 5.0: 5.0.3; FortiSandbox 4.4: 4.4.9.
More Fortinet advisories
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