CVE-2026-21643Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via Site header injection

Published Feb 6, 2026 · Updated Feb 6, 2026

SQL injection in Fortinet FortiClient EMS 7.4.4 allows remote attackers to execute unauthorized code via crafted HTTP requests. A public proof of concept places unsanitized Site header data into PostgreSQL search_path while handling /api/v1/init_consts. The administrative interface requires no authentication, enabling database access and command execution; CISA lists active exploitation.

CVSS severity9.8
Critical
EPSS probability94.08%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Fortinet FortiClient EMS 7.4.4 allows remote attackers to execute unauthorized code via crafted HTTP requests. A public proof of concept places unsanitized Site header data into PostgreSQL search_path while handling /api/v1/init_consts. The administrative interface requires no authentication, enabling database access and command execution; CISA lists active exploitation.

The record

CVE
CVE-2026-21643
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
Fortinet
Product
FortiClient EMS
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2026Record updatedLatest update available in the CVE record.
  3. Apr 13, 2026Exploitation reportedCISA Known Exploited Vulnerabilities listing

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=7.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fortinet · FortiClient EMSversion=7.4.4

Published CVSS scores

9.8Fortinet, Inc.CVSS:3.1/AV:N/AC:L/PR:N/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 IPsShadowserver observations through Sep 15, 2026. Gaps indicate unavailable data.
Sep 9, 2026Sep 15, 2026
View daily counts
Reporting dayUnique IPs
Sep 9, 2026Unavailable
Sep 10, 2026Unavailable
Sep 11, 2026Unavailable
Sep 12, 2026Unavailable
Sep 13, 2026Unavailable
Sep 14, 20265
Sep 15, 20262
Latest reporting daySep 15, 2026
Latest daily unique IPs2
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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