# CVE-2023-5339: Mattermost Desktop logs all keystrokes during initial run after fresh installation

> Mattermost Desktop logs all keystrokes, including passwords, during the initial run after a fresh installation, exposing sensitive credentials.

- **Severity:** Medium 4.7 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Oct 2023
- **Updated:** 5 Sep 2024
- **Also known as:** GHSA-v725-xj67-9v99

## What is CVE-2023-5339?

CVE-2023-5339 is a medium-severity vulnerability in Mattermost, published on 17 Oct 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Mattermost Desktop fails to set an appropriate log level during initial run after fresh installation resulting in logging all keystrokes including password entry being logged.

Weakness: CWE-532 (Insertion of Sensitive Information into Log File), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2023-5339?

It affects 1 product.


Products: Mattermost Mattermost Desktop.

## How do I fix CVE-2023-5339?

No fix has been published for CVE-2023-5339 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-5339 being exploited?

There is no known exploitation of CVE-2023-5339 in the wild and no public exploit code.

## Other vulnerabilities in Mattermost

- [CVE-2016-11064](https://insights.sbomify.com/CVE-2016-11064/): Code injection in n/a (critical 9.8)
- [CVE-2019-20856](https://insights.sbomify.com/CVE-2019-20856/): Code injection in n/a (critical 9.8)
- [CVE-2019-20861](https://insights.sbomify.com/CVE-2019-20861/): Code injection in n/a (high 8.8)
- [CVE-2026-1046](https://insights.sbomify.com/CVE-2026-1046/): Arbitrary application execution via unvalidated server-controlled URLs in Help menu (high 7.6)
- [CVE-2020-14456](https://insights.sbomify.com/CVE-2020-14456/): Security feature bypass in n/a (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-5339 and fix it if it is affected.

What it is: CVE-2023-5339 is a medium-severity vulnerability in Mattermost, published on 17 Oct 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-5339 in the wild and no public exploit code.

Affected product: Mattermost. 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-2023-5339/ (Markdown: https://insights.sbomify.com/CVE-2023-5339/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-5339
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5339
- OSV: https://osv.dev/vulnerability/CVE-2023-5339

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-5339/
Summaries are generated and may contain mistakes; the official description above is the record.