CVE-2026-44277: A improper access control vulnerability in Fortinet FortiAuthenticator 8.0.2, FortiAuthenticator 8.0.0, FortiA

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-44277 is a critical-severity flaw (CVSS 9.8) affecting fortiauthenticator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A improper access control vulnerability in Fortinet FortiAuthenticator 8.0.2, FortiAuthenticator 8.0.0, FortiAuthenticator 6.6.0 through 6.6.8, FortiAuthenticator 6.5.0 through 6.5.6 may allow attacker to execute unauthorized code or commands via crafted requests.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-05-12
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 18:17 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

fortinet fortiauthenticator UPGRADE

Affected: >= 6.4.0 and <= 6.4.10 · >= 6.5.0 and < 6.5.7 · >= 6.6.0 and < 6.6.9 · >= 8.0.0 and < 8.0.3

Fixed in: 6.5.7, 6.6.9, 8.0.3

Safe to downgrade to: a release before 6.4.0

1. Check installed version

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

2. UPGRADE to 6.5.7 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortiauthenticator

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 6.4.0 (Debian / Ubuntu)

apt-cache madison fortiauthenticator sudo apt install fortiauthenticator=<VERSION_BEFORE_6.4.0> sudo apt-mark hold fortiauthenticator

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

dnf --showduplicates list fortiauthenticator sudo dnf downgrade fortiauthenticator-<VERSION_BEFORE_6.4.0> sudo dnf versionlock add fortiauthenticator

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-2026-44277?

fortiauthenticator: upgrade to 6.5.7, 6.6.9, 8.0.3. Exact commands for each OS are on this page.

Is CVE-2026-44277 being exploited?

CVE-2026-44277 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-2026-44277 affect?

CVE-2026-44277 affects fortiauthenticator. Severity is critical (CVSS 9.8). A improper access control vulnerability in Fortinet FortiAuthenticator 8.0.2, FortiAuthenticator 8.0.0, FortiAuthenticator 6.6.0 through 6.6.8, FortiAuthenticator 6.5.0 through 6.5.6 may allow attacker to execute unauthorized code or comman

How urgent is CVE-2026-44277?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Fortinet vulnerabilities

Related CVEs

CVE-2025-53379 HIGH 7.5 UPGRADE A out-of-bounds read vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.2, FortiAuthenticator 6.5

References

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