What is CVE-2023-4478?

CVE-2023-4478 is a vulnerability in Mattermost that allows an attacker to register users as inactive during signup, blocking them from accessing Mattermost.

How does CVE-2023-4478 affect Mattermost?

CVE-2023-4478 affects Mattermost versions up to 7.8.9, versions between 7.9.0 and 7.10.5, and version 8.0.0 by allowing an attacker to register users as inactive during signup.

What is the severity of CVE-2023-4478?

The severity of CVE-2023-4478 is rated as high with a CVSS score of 8.2.

How can an attacker exploit CVE-2023-4478?

An attacker can exploit CVE-2023-4478 by manipulating the parameters' values in the signup request to register users as inactive, blocking them from accessing Mattermost.

Is there a fix for CVE-2023-4478?

Yes, Mattermost has released security updates to fix CVE-2023-4478. It is recommended to update to the latest version of Mattermost to mitigate the vulnerability.

Vulnerability/
CVE-2023-4478

high

8.2

CWE

EPSS

0.046%

25/8/2023

31/8/2023

CVE-2023-4478

First published: Fri Aug 25 2023(Updated: )

Mattermost fails to restrict which parameters' values it takes from the request during signup allowing an attacker to register users as inactive, thus blocking them from later accessing Mattermost without the system admin activating their accounts.

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

Affected Software	Affected Version	How to fix
Mattermost Mattermost Server	<7.8.9
Mattermost Mattermost Server	>=7.9.0<7.10.5
Mattermost Mattermost Server	=8.0.0

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Reference Links

https://mattermost.com/security-updates

Frequently Asked Questions

What is CVE-2023-4478?
CVE-2023-4478 is a vulnerability in Mattermost that allows an attacker to register users as inactive during signup, blocking them from accessing Mattermost.
How does CVE-2023-4478 affect Mattermost?
CVE-2023-4478 affects Mattermost versions up to 7.8.9, versions between 7.9.0 and 7.10.5, and version 8.0.0 by allowing an attacker to register users as inactive during signup.
What is the severity of CVE-2023-4478?
The severity of CVE-2023-4478 is rated as high with a CVSS score of 8.2.
How can an attacker exploit CVE-2023-4478?
An attacker can exploit CVE-2023-4478 by manipulating the parameters' values in the signup request to register users as inactive, blocking them from accessing Mattermost.
Is there a fix for CVE-2023-4478?
Yes, Mattermost has released security updates to fix CVE-2023-4478. It is recommended to update to the latest version of Mattermost to mitigate the vulnerability.

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vendor/mattermost
canonical/mattermost mattermost server
version/mattermost mattermost server/7.9.0
version/mattermost mattermost server/8.0.0

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