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Exploitation reportedNot in CISA KEV yetFix available

CVE-2026-39813

Exploitation reported by one source. First attested on 2026-06-15 by GCVE · kevintel.

  • Published2026-04-14
  • Fixed in5.0.6 · 4.4.9
  • WeaknessCWE-24

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A path traversal: '../filedir' vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8 may allow attacker to escalation of privilege via specially crafted HTTP requests.

Timeline

dates in UTC
  1. 2026-04-1416:16CVE publishedNVD
  2. 2026-06-1512:48Listed as exploited by GCVEGCVE
  3. 2026-06-1512:48Exploitation first reportedGCVE
  4. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-25 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-39813?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-39813?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Fortinet fortisandbox
BranchAffectedFixed in
5.0≥ 5.0.0, < 5.0.65.0.6
4.4≥ 4.4.0, < 4.4.94.4.9

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Fortinet fortisandbox to 5.0.6 · 4.4.9

Advisories and patches

Detection

read 2026-10-25 00:28 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverified0xBlackash/CVE-2026-39813HORKimhab/CVE-2026-39813
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • GCVEexploitation2026-06-15
  • CISA-ADPSSVC decisionnone2026-04-14
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.19.8read 2026-10-23
  • CNAweakness (CWE)CWE-24read 2026-10-23
  • FIRST EPSSEPSS score22.2 %2026-10-25
  • PoC-in-GitHubproof of concept2read 2026-10-25

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-04-14
Last Modified
2026-06-18
NVD status
Modified

Frequently asked questions

What is CVE-2026-39813?

A path traversal: '../filedir' vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8 may allow attacker to escalation of privilege via specially crafted HTTP requests.

Is CVE-2026-39813 actively exploited?

Active exploitation of CVE-2026-39813 has not been confirmed. Its EPSS score was 22.2% on 2026-10-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-39813?

CVE-2026-39813 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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