# CVE-2024-39772: Silent Desktop Screenshot Capture

> Attackers can silently capture high-quality screenshots via JavaScript APIs in the Mattermost Desktop App, exposing sensitive visual data.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Sep 2024
- **Updated:** 16 Sep 2024
- **Also known as:** BIT-mattermost-2024-39772, GHSA-5777-rcjj-9p22

## What is CVE-2024-39772?

CVE-2024-39772 is a low-severity vulnerability in Mattermost, published on 16 Sep 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mattermost Desktop App versions <=5.8.0 fail to safeguard screen capture functionality which allows an attacker to silently capture high-quality screenshots via JavaScript APIs.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2024-39772?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mattermost-desktop` | npm | All versions | 5.9.0 |
| `mattermost-desktop` | npm | All versions | 5.9.0 |
| `mattermost` | Bitnami | All versions | 5.9.0 |

Products: Mattermost Mattermost Desktop.

## How do I fix CVE-2024-39772?

Upgrade mattermost-desktop to 5.9.0 or later.

## Is CVE-2024-39772 being exploited?

There is no known exploitation of CVE-2024-39772 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-2024-39772 and fix it if it is affected.

What it is: CVE-2024-39772 is a low-severity vulnerability in Mattermost, published on 16 Sep 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-39772 in the wild and no public exploit code.

Affected packages and fixed versions:
- mattermost-desktop (npm): affected all versions; fixed in 5.9.0
- mattermost-desktop (npm): affected all versions; fixed in 5.9.0
- mattermost (Bitnami): affected all versions; fixed in 5.9.0

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-2024-39772/ (Markdown: https://insights.sbomify.com/CVE-2024-39772/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-39772
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-39772
- OSV: https://osv.dev/vulnerability/CVE-2024-39772

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-39772/
Summaries are generated and may contain mistakes; the official description above is the record.