Is CVE-2024-39772 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2024-39772 being exploited in the wild.

How severe is CVE-2024-39772?

Low severity, with a CVSS score of 3.1, published 16 September 2024.

Which products and versions are affected?

Mattermost Desktop App 0 through 5.8.0.

Is there a fix for CVE-2024-39772?

A patch was published on 2024-09-16: Fix available in version 5.9.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2024-39772 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2024-39772?

Check whether you run Mattermost Desktop App at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2024-39772: Mattermost Desktop App insufficient screen capture protection

CVE-2024-39772 · Severity: low · CVSS 3.1 · Published 2024-09-16

Mattermost Desktop App, a messaging platform client for Windows, Mac, and Linux, fails to properly restrict screen capture functionality. An attacker can exploit this to silently capture high-quality screenshots via JavaScript APIs, potentially exposing sensitive conversation content, credentials, or other confidential information displayed on screen without user awareness or consent.

Technologies: Mattermost Desktop App. Vendors: Mattermost.

Quick answers

Is CVE-2024-39772 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2024-39772 being exploited in the wild.
How severe is CVE-2024-39772?: Low severity, with a CVSS score of 3.1, published 16 September 2024.
Which products and versions are affected?: Mattermost Desktop App 0 through 5.8.0.
Is there a fix for CVE-2024-39772?: A patch was published on 2024-09-16: Fix available in version 5.9.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2024-39772 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2024-39772?: Check whether you run Mattermost Desktop App at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a missing access control issue (CWE-284) in Mattermost Desktop App versions ≤5.8.0 that fails to enforce restrictions on screen capture APIs accessible via JavaScript. An attacker with code execution capability (e.g., through malicious JavaScript injection or a compromised plugin) can invoke screen capture functionality without triggering user notifications or permission prompts, enabling silent capture of high-quality screenshots of application content. The attack requires network access and does not require user interaction or elevated privileges. The vulnerability is fixed in version 5.9.0 and later. Patches are available and users should upgrade immediately to mitigate exposure of sensitive chat content and information.

Affected products

Mattermost Mattermost Desktop App 0 through 5.8.0

Identifiers

CVE-2024-39772
GHSA-5777-rcjj-9p22

Timeline

2024-09-16: disclosed
2024-09-16: patched: Fix available in version 5.9.0

References

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