What is the severity of CVE-2023-6727?

CVE-2023-6727 is considered a medium severity vulnerability due to improper authorization checks in Mattermost.

How do I fix CVE-2023-6727?

To fix CVE-2023-6727, upgrade Mattermost Server to version 9.2.2 or later, or to a version before 8.1.6.

Who is affected by CVE-2023-6727?

CVE-2023-6727 affects Mattermost Server versions up to 8.1.5 and versions 9.2.0 to 9.2.1.

What types of actions can be exploited in CVE-2023-6727?

CVE-2023-6727 allows unauthorized users to create playbook actions that can post messages in channels.

Is there a workaround for CVE-2023-6727?

Currently, there is no documented workaround for CVE-2023-6727 other than upgrading to a secure version of Mattermost.

Vulnerability/
CVE-2023-6727

medium

4.3

CWE

200

EPSS

0.045%

12/12/2023

2/8/2024

CVE-2023-6727: Leak Inaccessible Playbook Information via Channel Action IDOR

First published: Tue Dec 12 2023(Updated: )

Mattermost fails to perform correct authorization checks when creating a playbook action, allowing users without access to the playbook to create playbook actions. If the playbook action created is to post a message in a channel based on specific keywords in a post, some playbook information, like the name, can be leaked.

Credit: responsibledisclosure@mattermost.com

Affected Software	Affected Version	How to fix
Mattermost	<=8.1.5
Mattermost	>=9.2.0<=9.2.1

Remedy

Update Mattermost Server to versions 8.1.6, 9.2.2 or higher.

Never miss a vulnerability like this again

Reference Links

https://mattermost.com/security-updates

Frequently Asked Questions

What is the severity of CVE-2023-6727?
CVE-2023-6727 is considered a medium severity vulnerability due to improper authorization checks in Mattermost.
How do I fix CVE-2023-6727?
To fix CVE-2023-6727, upgrade Mattermost Server to version 9.2.2 or later, or to a version before 8.1.6.
Who is affected by CVE-2023-6727?
CVE-2023-6727 affects Mattermost Server versions up to 8.1.5 and versions 9.2.0 to 9.2.1.
What types of actions can be exploited in CVE-2023-6727?
CVE-2023-6727 allows unauthorized users to create playbook actions that can post messages in channels.
Is there a workaround for CVE-2023-6727?
Currently, there is no documented workaround for CVE-2023-6727 other than upgrading to a secure version of Mattermost.

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