What is the CVSS score of CVE-2026-59836?

CVE-2026-59836 has a contested CVSS base score of 9.8 from a third party (e.g. CISA-ADP), while the vendor rates it Critical. vuln.today uses the vendor rating as authoritative.

Which versions of Forticlientems are affected by CVE-2026-59836?

Fortinet FortiClientEMS versions 7.2 through 7.4 contain a critical certificate validation flaw (CVE-2026-59836, CVSS 9.8) that allows network-positioned attackers to intercept and decrypt…

How to fix or mitigate CVE-2026-59836?

Within 24 hours: Identify all FortiClientEMS deployments and document affected versions (7.2.0-7.2.14, 7.4.0-7.4.1, 7.4.3-7.4.5); inventory total managed endpoints and assess sensitivity of data transiting EMS communications. Within 7 days: Enable packet inspection and monitoring on EMS traffic lanes for anomalous TLS handshake patterns; implement network-layer access controls restricting EMS server connectivity to trusted administrative subnets only; deploy VPN or edge encryption appliances to add transport-layer protection to EMS communications if available. Within 30 days: Establish automated monitoring of Fortinet security advisories and FortiClientEMS release notes for patch availability; evaluate alternative endpoint management platforms if Fortinet does not release patch within 60 days; conduct forensic assessment of EMS logs to identify whether traffic interception occurred during vulnerability window.

Forticlientems CVE-2026-59836

EUVD-2026-43714 CRITICAL

Improper Certificate Validation (CWE-295)

2026-07-14 fortinet

GHSA-gp77-r46p-xfvc

Information Disclosure Fortinet Forticlientems

Critical

Disputed · 9.8 NVD

Severity by source

Sources disagree (Medium–Critical)

Vendor (fortinet) PRIMARY

MEDIUM

qualitative

NVD

9.8 CRITICAL

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

vuln.today AI

6.8 MEDIUM

MitM positioning needed (AC:H); no auth required (PR:N); client must connect (UI:R); cert bypass yields interception and modification but not availability loss (A:N).

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

4.0 AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Jul 15, 2026 - 15:14 vuln.today

v2 (cvss_changed)

Re-analysis Queued

Jul 15, 2026 - 15:07 vuln.today

cvss_changed

Severity Changed

Jul 15, 2026 - 15:07 NVD

HIGH CRITICAL

CVSS changed

Jul 15, 2026 - 15:07 NVD

7.5 (HIGH) 9.8 (CRITICAL)

Severity Changed

Jul 14, 2026 - 16:22 NVD

MEDIUM HIGH

CVSS changed

Jul 14, 2026 - 16:22 NVD

6.7 (MEDIUM) 7.5 (HIGH)

Analysis Generated

Jul 14, 2026 - 16:09 vuln.today

CVE Published

Jul 14, 2026 - 15:15 cve.org

MEDIUM 6.7

DescriptionNVD

A improper certificate validation vulnerability in Fortinet FortiClientEMS 7.4.3 through 7.4.5, FortiClientEMS 7.4.0 through 7.4.1, FortiClientEMS 7.2 all versions may allow attacker to information disclosure via <insert attack vector here>

Articles & Coverage 1

News 4 New Fortinet Vulnerabilities - 4 High Severity Jul 15, 2026

AnalysisAI

Improper TLS certificate validation in Fortinet FortiClientEMS (Endpoint Management Server) exposes sensitive information to network-positioned attackers across FortiClientEMS 7.2 (all listed builds up to 7.2.14), 7.4.0–7.4.1, and 7.4.3–7.4.5. Because the client fails to properly verify server certificates (CWE-295), an attacker able to intercept EMS communications can decrypt or observe protected traffic to disclose information. There is no public exploit identified at time of analysis and CISA SSVC scores exploitation as 'none', but Fortinet rates the flaw CVSS 9.8, so patching should be prioritized despite the lack of observed exploitation.