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ForticlientemsApplication · Fortinet

CVE-2026-59836

CRITICAL · 9.8 CVSS v3.1 Published 2026-07-14
Fix available
A fix is available. Upgrade to 7.4.6 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click 5 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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>

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Improper certificate validation vulnerability in Fortinet FortiClientEMS allows attackers to perform man-in-the-middle attacks by exploiting insufficient validation of SSL/TLS certificates, leading to information disclosure. The exact attack vector is not fully specified in the available description.

MitigationUpdate FortiClientEMS to the latest patched version provided by Fortinet. Until patches are available, restrict network access to trusted entities and monitor for suspicious SSL/TLS traffic.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
ForticlientemsApplication
Affected:>= 7.2.0, <= 7.4.1>= 7.4.3, < 7.4.6

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify FortiClientEMS installation
    Open Windows Control Panel > Programs and Features, or check the Windows Services panel for 'FortiClientEMS' service, and note the exact version number displayed.
    Affected if The displayed version falls within 7.2.0 to 7.4.1, or 7.4.3 to 7.4.5 inclusive.
  2. Verify version via FortiClientEMS console
    Log into the FortiClientEMS web console, navigate to the Dashboard or Settings section, and locate the version information typically shown under System Settings or About.
    Affected if The version shown matches the affected ranges listed above.
  3. Check FortiClientEMS service version
    Open Windows Command Prompt and run: sc queryex type= service state= all | findstr /i "FortiClientEMS" to find the service, then use: wmic product where "name like 'FortiClientEMS'" get version
    Affected if The returned version number is between 7.2.0 and 7.4.1, or between 7.4.3 and 7.4.5.
  4. Confirm SSL/TLS functionality is in use
    FortiClientEMS uses SSL/TLS for client connections by default. Verify by checking the EMS server configuration in the console under Server Settings > SSL/TLS settings, or by observing that endpoint agents connect to the EMS over HTTPS.
    Affected if The EMS server is configured to accept SSL/TLS connections (the default behavior), which is required for this vulnerability to be exploitable.

You are affected if FortiClientEMS version is 7.2.0 through 7.4.1, or 7.4.3 through 7.4.5, and the product is actively handling SSL/TLS connections (default configuration).

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 7.4.6 or later
Fixed in 7.4.6
Interim mitigation

Update FortiClientEMS to the latest patched version provided by Fortinet. Until patches are available, restrict network access to trusted entities and monitor for suspicious SSL/TLS traffic.

Recommended fix High confidence

FortiClientEMS 7.4.6 or later (7.2.x users should upgrade to 7.4.6 or later)

  1. Obtain FortiClientEMS version 7.4.6 or later from the Fortinet support portal (https://support.fortinet.com)
  2. Review Fortinet's upgrade documentation for FortiClientEMS before proceeding
  3. Backup the current FortiClientEMS configuration
  4. Deploy the upgrade following Fortinet's standard upgrade procedure
  5. Verify the upgrade was successful by checking the version number in the management console
  6. Confirm the certificate validation vulnerability is resolved
Caveat Review Fortinet release notes for 7.4.6 for any configuration or behavioral changes before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Forticlientems Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-59836 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data