9.8

CVE-2026-39813: fortinet fortisandbox Path Traversal: '../filedir'

CVSS: 9.8v3.1CriticalKEVModified
Published 14-04-2026Last modified 18-06-2026
Open JSON

Vulnerability summary

CVE-2026-39813 is a critical (CVSS 9.8) Path Traversal: '../filedir' vulnerability in fortinet fortisandbox. It is known to be exploited: CIRCL lists it, first on 22-06-2026. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.72%
0%100%
Low · -21.50 pp in 30 days
KEVListedCIRCL
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-04-2026
    PublishedVulnerability first disclosed.
  2. 18-06-2026
    Last modifiedVulnerability information updated.
  3. 22-06-2026
    Added to CIRCL KEVAdded to the CIRCL known exploited vulnerabilities catalog.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.72%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

-21.50 pp

From 22.22% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.72%

Known exploited

Compare KEV catalogs
CIRCLListed
Added
22-06-2026

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fortinet2 products

1 vendor · 2 products

References

1 links