CVE-2026-21741Network attack vector

User redirection via crafted CSV file

Published Apr 14, 2026 · Updated Apr 14, 2026

Open redirect in Fortinet FortiNAC-F allows remote authenticated users with system administrator access to redirect users via crafted CSV files. Fortinet has not disclosed which CSV field or import path supplies the untrusted destination, or where the application accepts it without validation. A system administrator must craft the file and another user must interact with it; the bounded consequence is navigation to an arbitrary website.

CVSS severity4.8
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Fortinet FortiNAC-F allows remote authenticated users with system administrator access to redirect users via crafted CSV files. Fortinet has not disclosed which CSV field or import path supplies the untrusted destination, or where the application accepts it without validation. A system administrator must craft the file and another user must interact with it; the bounded consequence is navigation to an arbitrary website.

The record

CVE
CVE-2026-21741
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Fortinet
Product
FortiNAC-F
Classifications
CWE-601, T1204
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.2.0 <=7.2.9
  2. Affected versionversion=7.4.0 <=7.4.3
  3. Affected versionversion=7.6.0 <=7.6.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Fortinet · FortiNAC-Fversion=7.2.0 <=7.2.9; version=7.4.0 <=7.4.3; version=7.6.0 <=7.6.5

Published CVSS scores

2.4FortinetCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
2.2FortinetCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204User Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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