# CVE-2026-21643: Fortinet FortiClient EMS SQL Injection

> Unauthenticated attackers can execute unauthorized code via SQL injection in FortiClient EMS, requiring immediate patching.

- **Severity:** Critical 9.1 (`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`)
- **Exploited in the wild:** Yes, since 13 Apr 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Feb 2026
- **Updated:** 14 Apr 2026
- **Also known as:** GHSA-r6vr-hwpr-qqch

## What is CVE-2026-21643?

CVE-2026-21643 is a critical SQL injection vulnerability in Fortinet FortiClientEMS, published on 6 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2026-21643?

It affects 1 product.


Products: Fortinet Forticlientems.

## How do I fix CVE-2026-21643?

No fix has been published for CVE-2026-21643 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 16 Apr 2026.

## Is CVE-2026-21643 being exploited?

Yes. Attackers have exploited CVE-2026-21643 in the wild since at least 13 Apr 2026.

Public exploit code:

- CVE-2026-21643 (github_poc): https://github.com/0xredash/CVE-2026-21643
- Python PoC and Nuclei template for CVE-2026-21643 (Pre-Authentication SQL Injection in FortiClient EMS 7.4.4) (github_poc): https://github.com/alirezac0/CVE-2026-21643
- Fortinet FortiClientEMS 7.4.4 - SQL Injection (nuclei): http/cves/2026/CVE-2026-21643.yaml

## Other vulnerabilities in Fortinet FortiClientEMS

- [CVE-2026-35616](https://insights.sbomify.com/CVE-2026-35616/): Fortinet FortiClient EMS Improper Access Control (critical 9.1, exploited in the wild)
- [CVE-2024-23106](https://insights.sbomify.com/CVE-2024-23106/): Auth bypass in FortiClientEMS (high 7.7)
- [CVE-2025-59922](https://insights.sbomify.com/CVE-2025-59922/): SQL injection in FortiClientEMS (medium 6.8)
- [CVE-2026-59836](https://insights.sbomify.com/CVE-2026-59836/): Security feature bypass in FortiClientEMS (medium 6.7)
- [CVE-2026-39809](https://insights.sbomify.com/CVE-2026-39809/): SQL injection in FortiClientEMS (medium 6.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-21643 and fix it if it is affected.

What it is: CVE-2026-21643 is a critical SQL injection vulnerability in Fortinet FortiClientEMS, published on 6 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-21643 in the wild since at least 13 Apr 2026.

Affected product: Fortinet FortiClientEMS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-21643/ (Markdown: https://insights.sbomify.com/CVE-2026-21643/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-21643
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21643
- OSV: https://osv.dev/vulnerability/CVE-2026-21643

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-21643/
Summaries are generated and may contain mistakes; the official description above is the record.