CVE-2026-59841: A improper restriction of communication channel to intended endpoints vulnerability in Fortinet FortiSIEMWindo

Routine

HIGH 7.5UPGRADE

CVE-2026-59841 is a high-severity flaw (CVSS 7.5) affecting fortisiem. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A improper restriction of communication channel to intended endpoints vulnerability in Fortinet FortiSIEMWindowsAgent 7.4.0 through 7.4.1 may allow attacker to escalation of privilege 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	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-923
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 fortisiem UPGRADE

Affected: >= 7.4.0 and < 7.4.2

Fixed in: 7.4.2

Safe to downgrade to: a release before 7.4.0

1. Check installed version

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

2. UPGRADE to 7.4.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortisiem

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 7.4.0 (Debian / Ubuntu)

apt-cache madison fortisiem sudo apt install fortisiem=<VERSION_BEFORE_7.4.0> sudo apt-mark hold fortisiem

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

dnf --showduplicates list fortisiem sudo dnf downgrade fortisiem-<VERSION_BEFORE_7.4.0> sudo dnf versionlock add fortisiem

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-2026-59841?

fortisiem: upgrade to 7.4.2. Exact commands for each OS are on this page.

Is CVE-2026-59841 being exploited?

CVE-2026-59841 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-2026-59841 affect?

CVE-2026-59841 affects fortisiem. Severity is high (CVSS 7.5). A improper restriction of communication channel to intended endpoints vulnerability in Fortinet FortiSIEMWindowsAgent 7.4.0 through 7.4.1 may allow attacker to escalation of privilege via <insert attack vector here>

How urgent is CVE-2026-59841?

Priority 30/100. High severity

Software pages

Fortinet vulnerabilities

Related CVEs

CVE-2026-59838 MEDIUM 5.9 UPGRADE A improper neutralization of script-related html tags in a web page (basic xss) vulnerability in Fortinet Fort
CVE-2026-70467 LOW 3.8 UPGRADE A server-side request forgery (ssrf) vulnerability in Fortinet FortiSIEM 7.5.0, FortiSIEM 7.4.0 through 7.4.2,

References

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