CVE-2026-21743Network attack vector

Local-user modification via unprotected CSV import

Published Feb 10, 2026 · Updated Feb 10, 2026

Missing authorization in Fortinet FortiAuthenticator 6.3.0 through 6.6.6 allows remote authenticated users to modify local users. The GUI's CSV user-import endpoint accepts file uploads from read-only administrators without enforcing authorization required to change local-user records. A read-only administrative session is required, and the operation can alter the appliance's local identity data without higher administrative rights.

CVSS severity7.2
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Fortinet FortiAuthenticator 6.3.0 through 6.6.6 allows remote authenticated users to modify local users. The GUI's CSV user-import endpoint accepts file uploads from read-only administrators without enforcing authorization required to change local-user records. A read-only administrative session is required, and the operation can alter the appliance's local identity data without higher administrative rights.

The record

CVE
CVE-2026-21743
Published
Feb 10, 2026
Updated
Feb 10, 2026
Vendor
Fortinet
Product
FortiAuthenticator
Classifications
CWE-862, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 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=6.3.0 <=6.3.5
  2. Affected versionversion=6.4.0 <=6.4.11
  3. Affected versionversion=6.5.0 <=6.5.7
  4. Affected versionversion=6.6.0 <=6.6.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fortinet · FortiAuthenticatorversion=6.3.0 <=6.3.5; version=6.4.0 <=6.4.11; version=6.5.0 <=6.5.7; version=6.6.0 <=6.6.6

Published CVSS scores

7.2FortinetCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1098Account Manipulation

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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