What is CVE-2023-5333?

CVE-2023-5333 is a vulnerability in Mattermost that allows a simple user to cause the application to consume excessive resources and possibly crash.

How does Mattermost fail to deduplicate input IDs?

Mattermost fails to deduplicate input IDs when a user sends a specially crafted request to /api/v4/users/ids with multiple identical IDs.

What versions of Mattermost are affected by CVE-2023-5333?

Mattermost versions up to 7.8.11, 8.0.0 to 8.0.3, and 8.1.0 to 8.1.2 are affected by CVE-2023-5333.

What is the severity of CVE-2023-5333?

CVE-2023-5333 has a severity rating of medium (6.5).

How can I fix CVE-2023-5333?

To fix CVE-2023-5333, update your Mattermost server to a version that is not affected by the vulnerability.

Vulnerability/
CVE-2023-5333

medium

6.5

CWE

400

9/10/2023

5/9/2024

CVE-2023-5333: Denial of Service via multiple identical User IDs in /api/v4/users/ids

First published: Mon Oct 09 2023(Updated: )

Mattermost fails to deduplicate input IDs allowing a simple user to cause the application to consume excessive resources and possibly crash by sending a specially crafted request to /api/v4/users/ids with multiple identical IDs.

Credit: responsibledisclosure@mattermost.com responsibledisclosure@mattermost.com

Affected Software	Affected Version	How to fix
Mattermost Mattermost Server	<7.8.11
Mattermost Mattermost Server	>=8.0.0<8.0.3
Mattermost Mattermost Server	>=8.1.0<8.1.2

Remedy

Update Mattermost Server to versions 7.8.11, 8.0.3, 8.1.2 or higher.

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Reference Links

https://mattermost.com/security-updates

Frequently Asked Questions

What is CVE-2023-5333?
CVE-2023-5333 is a vulnerability in Mattermost that allows a simple user to cause the application to consume excessive resources and possibly crash.
How does Mattermost fail to deduplicate input IDs?
Mattermost fails to deduplicate input IDs when a user sends a specially crafted request to /api/v4/users/ids with multiple identical IDs.
What versions of Mattermost are affected by CVE-2023-5333?
Mattermost versions up to 7.8.11, 8.0.0 to 8.0.3, and 8.1.0 to 8.1.2 are affected by CVE-2023-5333.
What is the severity of CVE-2023-5333?
CVE-2023-5333 has a severity rating of medium (6.5).
How can I fix CVE-2023-5333?
To fix CVE-2023-5333, update your Mattermost server to a version that is not affected by the vulnerability.

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canonical/mattermost mattermost server
version/mattermost mattermost server/8.0.0
version/mattermost mattermost server/8.1.0

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