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Full vulnerability report · 2026
CVE-2026-21643High confidence

Fortinet FortiClient EMS SQL Injection Vulnerability

Fortinet · FortiClient EMS

Official source article: Fortinet FG-IR-25-1142 ↗. Check the applicable product and release in the original source.

9.1CriticalCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2026-04-16 as the remediation due date.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • CISA confirms exploitation in the wild.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 93.87% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Fortinet FortiClient EMS and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-5681

CISA KEV mirrored by ENISA

An improper neutralization of special elements used in an sql command ('sql injection') vulnerability in Fortinet FortiClientEMS 7.4.4 may allow an unauthenticated attacker to execute unauthorized code or commands via specifically crafted HTTP requests.

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 13 Apr 2026. Evidence sources: cisa_kev.
ENISA score
9.1 · CVSS 3.1
Advisory evidence
2 linked advisory records
Explicit mitigation evidence

Only statements that explicitly mention a fix, patch, update, workaround or mitigation are shown here.

  • csaf_ncscnl · NCSC-2026-0047Kwetsbaarheid verholpen in Fortinet FortiClient EMS
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2026-04-16 as the remediation due date.

Patch available
01

What, why and how

Fortinet FortiClient EMS contains a SQL injection vulnerability that may allow an unauthenticated attacker to execute unauthorized code or commands via specifically crafted HTTP requests.

What

Fortinet FortiClient EMS contains a SQL injection vulnerability that may allow an unauthenticated attacker to execute unauthorized code or commands via specifically crafted HTTP requests.

Why

Attacker-controlled data is not kept separate from SQL query syntax, allowing the intended database operation to be changed.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Fortinet FortiClient EMS contains a SQL injection vulnerability that may allow an unauthenticated attacker to execute unauthorized code or commands via specifically crafted HTTP requests.

Why

Attacker-controlled data is not kept separate from SQL query syntax, allowing the intended database operation to be changed.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2026-04-13.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-89 ↗

CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection'). The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-89CISA KEVPublic exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-5681Known-exploited evidence recorded

An improper neutralization of special elements used in an sql command ('sql injection') vulnerability in Fortinet FortiClientEMS 7.4.4 may allow an unauthenticated attacker to execute unauthorized code or commands via specifically crafted HTTP requests.

Official EUVD record ↗
BSI · German · WID-SEC-2026-0343Fortinet FortiClientEMS: Schwachstelle ermöglicht Codeausführung

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Fortinet FortiClientEMS ausnutzen, um eine SQL-Injection durchzuführen und so beliebigen Code auszuführen.

Official advisory ↗
Canadian Centre for Cyber Security · English · AV26-096Fortinet security advisory (AV26-096) – Update 2

On February 6, 2026, Fortinet published a security advisory to address a critical vulnerability in the following product: Open-source reporting indicates that CVE-2026-21643 is being exploited in the wild.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260211Security Bulletin 11 Feb 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 11 Feb 2026, published on 11 February 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0136Vulnérabilité dans Fortinet FortiClientEMS

Une vulnérabilité a été découverte dans Fortinet FortiClientEMS. Elle permet à un attaquant de provoquer une injection SQL (SQLi).

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-003966フォーティネットのFortiClientEMSにおけるSQL インジェクションの脆弱性

Fortinet FortiClientEMS 7.4.4 における SQL コマンドで使用される特殊要素が不適切に無効化される（SQL インジェクションの）脆弱性により、認証されていない攻撃者が特別に細工された HTTP リクエストを介して不正なコードやコマンドを実行できる可能性があります。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6758美 CISA 발표 주요 Exploit 정보공유(Update. 2026-04-13)

Fortinet SQL Injection Vulnerability

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6685Fortinet 제품 보안 업데이트 권고

FortiClientEMS에서 발생하는 SQL Injection 취약점(CVE-2026-21643) [1][2]

Official advisory ↗
NCSC-NL · Dutch · NCSC-2026-0047Kwetsbaarheid verholpen in Fortinet FortiClient EMS

De kwetsbaarheid met kenmerk CVE-2026-21643 betreft een kritieke kwetsbaarheid in FortiClient EMS. De oorzaak ligt in de onjuiste neutralisatie van speciale SQL-commando's, wat een ongeauthenticeerde kwaadwillende in staat stelt deze kwetsbaarheid te misbruiken door speciaal vervaardigde HTTP-verzoeken te verzenden en daarmee ongeautoriseerde code op de getroffen systemen kan uitvoeren. De kwetsbaarheid bevindt zich in de beheer-interface. Het is goed gebruik een dergelijke interface sowieso niet publiek toegankelijk te hebben, maar af te steunen in een separaat beheer-LAN. Inmiddels wordt misbruik waargenomen bij systemen waarvan de administrative interface publiek toegankelijk is.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
FortiClientEMS: 7.4.4
Fixed
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 6 Feb 2026 · Last source change 14 Apr 2026, 03:55 UTC · CWE-89 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-5681
Product sourceCISA KEV
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. BlackTree coverageBlackTree article coverage changed from no BlackTree article to 1 BlackTree article.
    Before
    no BlackTree article
    After
    1 BlackTree article
    BlackTree editorial ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added remediation: fortiguard.fortinet.com/FG-IR-25-1142.
    Before
    vendor advisory: fortiguard.fortinet.com/FG-IR-25-1142
    After
    remediation: fortiguard.fortinet.com/FG-IR-25-1142 · vendor advisory: fortiguard.fortinet.com/FG-IR-25-1142
    psirt@fortinet.com ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    7.4.4 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    FortiClientEMS: 7.4.4 · Fixed: Upgrade to upcoming FortiClientEMS version 8.0.0 or above; Upgrade to FortiClientEMS version 7.4.5 or above
    CNA ↗
  4. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    psirt@fortinet.com ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-5681↗CISA KEV record↗CVE authority or vendor reference · Fortinet FG-IR-25-1142↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-21643 · cve.blacktree.nl