CVE-2026-21741: An URL Redirection to Untrusted Site ('Open Redirect') vulnerability [CWE-601] vulnerability in Fortinet Forti

Routine

LOW 2.4UPGRADE

CVE-2026-21741 is a low-severity flaw (CVSS 2.4) affecting fortinac-f. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An URL Redirection to Untrusted Site ('Open Redirect') vulnerability [CWE-601] vulnerability in Fortinet FortiNAC-F 7.6.0 through 7.6.5, FortiNAC-F 7.4 all versions, FortiNAC-F 7.2 all versions may allow a remote privileged attacker with system administrator role to redirect users to an arbitrary website via crafted CSV file.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	2.4 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-04-14
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

2026-04-14 16:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

fortinet fortinac-f UPGRADE

Affected: >= 7.2.0 and < 7.6.6

Fixed in: 7.6.6

Safe to downgrade to: a release before 7.2.0

1. Check installed version

apt-cache policy fortinac-f || rpm -q fortinac-f || fortinac-f --version

2. UPGRADE to 7.6.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fortinac-f

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortinac-f

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 fortinac-f sudo apt install fortinac-f=<VERSION_BEFORE_7.2.0> sudo apt-mark hold fortinac-f

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

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

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-2026-21741?

fortinac-f: upgrade to 7.6.6. Exact commands for each OS are on this page.

Is CVE-2026-21741 being exploited?

CVE-2026-21741 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-2026-21741 affect?

CVE-2026-21741 affects fortinac-f. Severity is low (CVSS 2.4). An URL Redirection to Untrusted Site ('Open Redirect') vulnerability [CWE-601] vulnerability in Fortinet FortiNAC-F 7.6.0 through 7.6.5, FortiNAC-F 7.4 all versions, FortiNAC-F 7.2 all versions may allow a remote privileged attacker with sy

How urgent is CVE-2026-21741?

Priority 11/100. No elevated risk signals yet.

Software pages

Fortinet vulnerabilities

References

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