What is the severity of CVE-2023-2831?

The severity of CVE-2023-2831 is medium, with a severity value of 6.5.

Which versions of Mattermost are affected by CVE-2023-2831?

Mattermost versions 7.1.0 to 7.1.9, 7.8.0 to 7.8.4, 7.9.0 to 7.9.3, and 7.10.0 are affected by CVE-2023-2831.

How can I fix CVE-2023-2831?

To fix CVE-2023-2831, update Mattermost to a version that is not affected by the vulnerability. Refer to the Mattermost security updates page for more information.

Vulnerability/
CVE-2023-2831

medium

6.5

CWE

400

16/6/2023

2/8/2024

CVE-2023-2831: Denial of Service while unescaping a Markdown string

Q: What is CVE-2023-2831?

CVE-2023-2831 is a vulnerability in Mattermost that allows an attacker to cause a Denial of Service by sending a message containing a large number of escaped characters.

First published: Fri Jun 16 2023(Updated: )

Mattermost fails to unescape Markdown strings in a memory-efficient way, allowing an attacker to cause a Denial of Service by sending a message containing a large number of escaped characters.

Credit: responsibledisclosure@mattermost.com

Affected Software	Affected Version	How to fix
Mattermost Mattermost	>=7.1.0<=7.1.9
Mattermost Mattermost	>=7.8.0<=7.8.4
Mattermost Mattermost	>=7.9.0<=7.9.3
Mattermost Mattermost	=7.10.0

Remedy

Update Mattermost to version 7.1.10, 7.8.5, 7.9.4, 7.10.1 or higher.

Never miss a vulnerability like this again

Reference Links

https://mattermost.com/security-updates/

Frequently Asked Questions

What is CVE-2023-2831?
CVE-2023-2831 is a vulnerability in Mattermost that allows an attacker to cause a Denial of Service by sending a message containing a large number of escaped characters.
How does Mattermost fail to unescape Markdown strings?
Mattermost fails to unescape Markdown strings in a memory-efficient way.
What is the severity of CVE-2023-2831?
The severity of CVE-2023-2831 is medium, with a severity value of 6.5.
Which versions of Mattermost are affected by CVE-2023-2831?
Mattermost versions 7.1.0 to 7.1.9, 7.8.0 to 7.8.4, 7.9.0 to 7.9.3, and 7.10.0 are affected by CVE-2023-2831.
How can I fix CVE-2023-2831?
To fix CVE-2023-2831, update Mattermost to a version that is not affected by the vulnerability. Refer to the Mattermost security updates page for more information.

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agent/references
agent/author
agent/title
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agent/tags
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agent/first-publish-date
agent/event
vendor/mattermost
canonical/mattermost mattermost
version/mattermost mattermost/7.1.0
version/mattermost mattermost/7.1.9
version/mattermost mattermost/7.8.0
version/mattermost mattermost/7.8.4
version/mattermost mattermost/7.9.0
version/mattermost mattermost/7.9.3
version/mattermost mattermost/7.10.0

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