# CVE-2026-59836: Security feature bypass in FortiClientEMS

> Improper certificate validation in FortiClient EMS allows attackers to disclose sensitive information.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Jul 2026
- **Updated:** 15 Jul 2026
- **Also known as:** GHSA-gp77-r46p-xfvc

## What is CVE-2026-59836?

CVE-2026-59836 is a medium-severity vulnerability in Fortinet FortiClientEMS, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A improper certificate validation vulnerability in Fortinet FortiClientEMS 7.4.3 through 7.4.5, FortiClientEMS 7.4.0 through 7.4.1, FortiClientEMS 7.2 all versions may allow attacker to information disclosure via <insert attack vector here>

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2026-59836?

It affects 1 product.


Products: Fortinet Forticlientems.

## How do I fix CVE-2026-59836?

No fix has been published for CVE-2026-59836 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-59836 being exploited?

There is no known exploitation of CVE-2026-59836 in the wild and no public exploit code.

## 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-2026-21643](https://insights.sbomify.com/CVE-2026-21643/): Fortinet FortiClient EMS SQL Injection (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-2026-39809](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-2026-59836 and fix it if it is affected.

What it is: CVE-2026-59836 is a medium-severity vulnerability in Fortinet FortiClientEMS, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-59836 in the wild and no public exploit code.

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-2026-59836/ (Markdown: https://insights.sbomify.com/CVE-2026-59836/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-59836
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-59836
- OSV: https://osv.dev/vulnerability/CVE-2026-59836

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-59836/
Summaries are generated and may contain mistakes; the official description above is the record.