# CVE-2025-13321: Mattermost Desktop App logging sensitive information and fails to clear data on server deletion

> Attackers with local system access can read sensitive information from Mattermost Desktop App logs due to insufficient sanitization and data clearing.

- **Severity:** Low 3.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A: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:** 17 Dec 2025
- **Updated:** 17 Dec 2025
- **Also known as:** GHSA-g6qx-wq5w-wr8v

## What is CVE-2025-13321?

CVE-2025-13321 is a low-severity vulnerability in Mattermost, published on 17 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Mattermost Desktop App versions <6.0.0 fail to sanitize sensitive information from Mattermost logs and clear data on server deletion which allows an attacker with access to the users system to gain access to potentially sensitive information via reading the application logs.

Weakness: CWE-532 (Insertion of Sensitive Information into Log File)

## Which versions are affected by CVE-2025-13321?

2 open source packages ship an affected version, including mattermost-desktop. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mattermost-desktop` | npm | All versions to 3.6.0 | None |
| `mattermost-desktop` | npm | All versions to 3.6.0 | None |

Products: Mattermost Mattermost Desktop.

## How do I fix CVE-2025-13321?

No fix has been published for CVE-2025-13321 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-13321 being exploited?

There is no known exploitation of CVE-2025-13321 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-2025-13321 and fix it if it is affected.

What it is: CVE-2025-13321 is a low-severity vulnerability in Mattermost, published on 17 Dec 2025. 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-2025-13321 in the wild and no public exploit code.

Affected packages and fixed versions:
- mattermost-desktop (npm): affected all versions up to 3.6.0; no fix listed
- mattermost-desktop (npm): affected all versions up to 3.6.0; no fix listed

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-2025-13321/ (Markdown: https://insights.sbomify.com/CVE-2025-13321/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-13321
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-13321
- OSV: https://osv.dev/vulnerability/CVE-2025-13321

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-13321/
Summaries are generated and may contain mistakes; the official description above is the record.