4.8

CVE-2026-39812: fortinet fortisandbox Cross-site Scripting

CVSS: 4.8v3.1MediumAnalyzed
Published 14-04-2026Last modified 14-04-2026
Open JSON

Vulnerability summary

CVE-2026-39812 is a medium (CVSS 4.8) Cross-site Scripting vulnerability in fortinet fortisandbox. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.3% of scored vulnerabilities.

Overall risk
19/100
0100
Low · default modelHow is this calculated?
CVSS score
4.8/10
010
Medium · v3.1 (NVD)
EPSS score
0.24%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-04-2026
    PublishedVulnerability first disclosed.
  2. 14-04-2026
    Last modifiedVulnerability information updated.

Description

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>

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

+0.05 pp

From 0.19% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fortinet3 products
  • fortisandbox≥ 5.0.0, ≤ 5.0.4 | ≥ 4.4.0, ≤ 4.4.8 | ≥ 4.2.1, ≤ 4.2.8 | ≥ 4.2.0, ≤ 4.2.8 | ≥ 4.4.0, < 4.4.9 | ≥ 5.0.0, < 5.0.6
  • fortisandbox_cloud≥ 22.2.4134, ≤ 23.1.4260 | ≥ 23.3.4329, ≤ 24.1.4436 | 5.0.4 | 5.0.5
  • fortisandbox_paas≥ 5.0.0, ≤ 5.0.5 | ≥ 4.4.0, ≤ 4.4.8 | ≥ 4.2.1, ≤ 4.2.8

1 vendor · 3 products

References

1 links