CVE-2026-59836: A improper certificate validation vulnerability in Fortinet FortiClientEMS 7.4.3 through 7.4.5, FortiClientEMS

Routine

HIGH 7.5UPGRADE

CVE-2026-59836 is a high-severity flaw (CVSS 7.5) affecting forticlientems. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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>

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-295
Published	2026-07-14
Last modified	2026-10-24

Publisher (CNA): Fortinet, Inc. · Vendor: fortinet

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 16:17 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

fortinet forticlientems UPGRADE

Affected: >= 7.2.0 and <= 7.4.1 · >= 7.4.3 and < 7.4.6

Fixed in: 7.4.6

Safe to downgrade to: a release before 7.2.0

1. Check installed version

apt-cache policy forticlientems || rpm -q forticlientems || forticlientems --version

2. UPGRADE to 7.4.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade forticlientems

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade forticlientems

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.2.0 (Debian / Ubuntu)

apt-cache madison forticlientems sudo apt install forticlientems=<VERSION_BEFORE_7.2.0> sudo apt-mark hold forticlientems

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list forticlientems sudo dnf downgrade forticlientems-<VERSION_BEFORE_7.2.0> sudo dnf versionlock add forticlientems

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-59836?

forticlientems: upgrade to 7.4.6. Exact commands for each OS are on this page.

Is CVE-2026-59836 being exploited?

CVE-2026-59836 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-59836 affect?

CVE-2026-59836 affects forticlientems. Severity is high (CVSS 7.5). 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>

How urgent is CVE-2026-59836?

Priority 29/100. High severity

Software pages

Fortinet vulnerabilities

References

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