CVE-2026-59839: A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2…

Medium severity · published Jul 14, 2026

CVE-2026-59839

A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2…

5.5

CVSS

0.3%

EPSS

On KEV

Description

A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiPAM 1.8.0, FortiPAM 1.7.0 through 1.7.2, FortiPAM 1.6 all versions, FortiPAM 1.5 all versions, FortiPAM 1.4 all versions, FortiPAM 1.3 all versions, FortiPAM 1.2 all versions, FortiPAM 1.1 all versions, FortiPAM 1.0 all versions, FortiProxy 7.6.0 through 7.6.5, FortiProxy 7.4 through 7.4.13, FortiProxy 7.2 all versions, FortiProxy 7.0 all versions may allow attacker to execute unauthorized code or commands via <insert attack vector here>

CVSS vector

CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

Attack vector

Physical

Complexity

Low

Privileges

High

User interaction

None

Confidentiality

None

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.3% · higher than 16% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

FortiOS · Fortinet

7.6.0 through 7.6.6; 7.4.0 through 7.4.9; 7.2.0 through 7.2.13; 7.0.0 through 7.0.19; 6.4.0 through 6.4.16 · source: vendor, NVD

FortiPAM · Fortinet

1.8.0; 1.7.0 through 1.7.2; 1.6.0 through 1.6.2; 1.5.0 through 1.5.1; 1.4.0 through 1.4.3; 1.3.0 through 1.3.1; +3 more · source: vendor, NVD

FortiProxy · Fortinet

7.6.0 through 7.6.5; 7.4.0 through 7.4.13; 7.2.0 through 7.2.16; 7.0.0 through 7.0.23 · source: vendor, NVD

RUGGEDCOM APE1808 · Siemens

0 · source: CISA

In the news

VulnerabilityMedium

Siemens RUGGEDCOM APE1808

View CSAF Summary Fortinet has published information on vulnerabilities in FortiOS. This advisory lists the related Siemens Industrial products. Siemens recommends to contact customer support for additional information, and follow Fortinet advisory for workarounds and mitigation measures. The following versions of Siemens RUGGEDCOM APE1808 are affected: RUGGEDCOM APE1808 vers:all/* (CVE-2026-23573, CVE-2026-59839) CVSS Vendor Equipment Vulnerabilities v3 6.1 Siemens Siemens RUGGEDCOM APE1808 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') Background Critical Infrastructure Sectors: Critical Manufacturing, Energy, Transportation Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-23573 An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6, FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiPAM 1.8.0, FortiPAM 1.7 all versions, FortiPAM 1.6 all versions, FortiPAM 1.5 all versions, FortiPAM 1.4 all versions, FortiPAM 1.3 all versions, FortiPAM 1.2 all versions, FortiPAM 1.1 all versions, FortiPAM 1.0 all versions, FortiProxy 7.4.0 through 7.4.3, FortiProxy 7.2.0 through 7.2.9 may allow an ...

CVE-2026-23573 CVE-2026-59839

Aug 12, 2026·CISA Advisories

Affected product

FortiOS

Fortinet

All FortiOS CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-59839

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-59839

Vendor Advisory

https://fortiguard.fortinet.com/psirt/FG-IR-26-151

cert-portal.siemens.com

https://cert-portal.siemens.com/productcert/html/ssa-127084.html