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CVE-2026-21743

A missing authorization vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.6, FortiAuthenticator 6.5 all versions,…

Medium6.8EPSS 0.37%
Published
Updated
Reserved
Assigned by
fortinet

Description

A missing authorization vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.6, FortiAuthenticator 6.5 all versions, FortiAuthenticator 6.4 all versions, FortiAuthenticator 6.3 all versions may allow a read-only user to make modification to local users via a file upload to an unprotected endpoint.

Scores

CVSS scores of CVE-2026-21743, by who scored it
Scored byCVSSScoreVector
fortinetCNA (assigner)3.1Medium6.8CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C
NVDNVD · Analyzed3.1High7.2CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.37% · top 69% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.

Weakness

Affected products

  • Fortinet · FortiAuthenticator

    • affected 6.6.0 – ≤ 6.6.6
    • affected 6.5.0 – ≤ 6.5.7
    • affected 6.4.0 – ≤ 6.4.11
    • affected 6.3.0 – ≤ 6.3.5

What to do

Solution: Upgrade to FortiAuthenticator version 8.0.0 or above Upgrade to FortiAuthenticator version 6.6.7 or above

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .