# CVE-2025-13326: Mattermost Desktop App fails to enable Hardened Runtime when packaged for Mac App Store

> Attackers can bypass macOS Hardened Runtime to inherit TCC permissions and access sensitive data by copying the binary.

- **Severity:** Low 3.9 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Dec 2025
- **Updated:** 17 Dec 2025
- **Also known as:** GHSA-4m4m-vm74-rqv4

## What is CVE-2025-13326?

CVE-2025-13326 is a low-severity vulnerability in Mattermost, published on 17 Dec 2025. 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 App versions <6.0.0 fail to enable the Hardened Runtime on the Mattermost Desktop App when packaged for Mac App Store which allows an attacker to inherit TCC permissions via copying the binary to a tmp folder.

Weakness: CWE-693 (Protection Mechanism Failure)

## Which versions are affected by CVE-2025-13326?

It affects 1 product.


Products: Mattermost Mattermost Desktop.

## How do I fix CVE-2025-13326?

No fix has been published for CVE-2025-13326 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-13326 being exploited?

There is no known exploitation of CVE-2025-13326 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-2025-13326 and fix it if it is affected.

What it is: CVE-2025-13326 is a low-severity vulnerability in Mattermost, published on 17 Dec 2025. 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-2025-13326 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-2025-13326/ (Markdown: https://insights.sbomify.com/CVE-2025-13326/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-13326
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-13326
- OSV: https://osv.dev/vulnerability/CVE-2025-13326

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-13326/
Summaries are generated and may contain mistakes; the official description above is the record.