# CVE-2026-11879: Arbitrary code execution in MobaXterm Personal Edition (Portable)

> Local attackers can execute arbitrary code by placing malicious DLLs in a predictable temporary directory loaded by MobaXterm during startup.

- **Severity:** High 8.5 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Jun 2026
- **Updated:** 12 Jun 2026
- **Also known as:** GHSA-9626-78xh-92cx

## What is CVE-2026-11879?

CVE-2026-11879 is a high-severity code injection vulnerability in Mobatek MobaXterm Personal Edition (Portable), published on 12 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

MobaXterm Personal Edition (Portable), in its 26.3 version (Build 5154), allows arbitrary code execution by loading malicious DLLs from a temporary directory that is predictable and can be modified by the user. During startup, the application searches for specific DLLs in this location before resorting to the system’s secure paths, enabling an attacker with local access to place a specially crafted DLL to be executed automatically when the victim launches the application.

Weakness: CWE-427 (Uncontrolled Search Path Element)

## Which versions are affected by CVE-2026-11879?


## How do I fix CVE-2026-11879?

No fix has been published for CVE-2026-11879 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11879 being exploited?

There is no known exploitation of CVE-2026-11879 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11879 and fix it if it is affected.

What it is: CVE-2026-11879 is a high-severity code injection vulnerability in Mobatek MobaXterm Personal Edition (Portable), published on 12 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-11879 in the wild and no public exploit code.

Affected product: Mobatek MobaXterm Personal Edition (Portable). 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-2026-11879/ (Markdown: https://insights.sbomify.com/CVE-2026-11879/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11879
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11879
- OSV: https://osv.dev/vulnerability/CVE-2026-11879

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-11879/
Summaries are generated and may contain mistakes; the official description above is the record.