CVE-2026-39813 Public exploit Critical · 9.1 EPSS 22.2%
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.
Fortinet · FortiSandbox
Summary
A path traversal flaw in the '../filedir' handling of Fortinet FortiSandbox, affecting versions 5.0.0 through 5.0.5 and 4.4.0 through 4.4.8, lets an attacker traverse outside the intended directory. An attacker with network access can exploit it without authentication or user interaction by sending specially crafted HTTP requests to gain escalated privileges.
Heading is the official description · CVE.org
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
73.3 / 100
- Exploited
- Yes, in VulnCheck KEV
- Reports
- 0
- Tactics
- 0/15
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 2 months after disclosure. Public exploit code (PoC-in-GitHub) appeared 9 days after disclosure.
- Disclosedday 0
- Public exploit codePoC-in-GitHub+9 days
- First seen exploitedVulnCheck KEV evidence+2 mo
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
No techniques linkedNo ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
What security researchers reported
Not named in any threat report yetAlso mentioned in 10 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- EbeeJuly2026 Pt16 Jul 2026
- Fortinet FortiBleed Global Compromise & Active Exploitation of Fortinet Vulnerabilities.1 Jul 2026
- Known_Cve | Apr 24, 2026 | Part 1/223 Apr 2026
- Known_Cve | Apr 23, 2026 | Part 1/222 Apr 2026
- Known_Cve | Apr 22, 2026 | Part 1/221 Apr 2026
- Known_Cve | Apr 21, 2026 | Part 1/220 Apr 2026
- 4 more on OTX