What is CVE-2023-2808?

CVE-2023-2808 is a vulnerability in Mattermost that allows an attacker to trigger a link preview on a disallowed domain using a specially crafted link.

What is the severity of CVE-2023-2808?

CVE-2023-2808 has a severity rating of medium (5.3).

Which versions of Mattermost are affected by CVE-2023-2808?

Mattermost versions 5.34.0 to 7.1.9, 7.2.0 to 7.8.4, and 7.9.0 to 7.9.3 are affected by CVE-2023-2808.

How can the CVE-2023-2808 vulnerability be fixed?

To fix the CVE-2023-2808 vulnerability, it is recommended to update Mattermost to a version that is not affected by the vulnerability.

Vulnerability/
CVE-2023-2808

medium

5.3

CWE

29/5/2023

6/12/2024

CVE-2023-2808: Lack of URL normalization allows rendering previews for disallowed domains

First published: Mon May 29 2023(Updated: )

Mattermost fails to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink, allowing an attacker to trigger link preview on a disallowed domain using a specially crafted link.

Credit: responsibledisclosure@mattermost.com

Affected Software	Affected Version	How to fix
Mattermost Mattermost	>=5.34.0<7.1.9
Mattermost Mattermost	>=7.2.0<7.8.4
Mattermost Mattermost	>=7.9.0<7.9.3

Remedy

Update Mattermost to version v7.1.9, v7.8.4, v7.9.3, v7.10, or higher.

Never miss a vulnerability like this again

Reference Links

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

Frequently Asked Questions

What is CVE-2023-2808?
CVE-2023-2808 is a vulnerability in Mattermost that allows an attacker to trigger a link preview on a disallowed domain using a specially crafted link.
How does Mattermost fail to normalize UTF confusable characters?
Mattermost fails to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink.
What is the severity of CVE-2023-2808?
CVE-2023-2808 has a severity rating of medium (5.3).
Which versions of Mattermost are affected by CVE-2023-2808?
Mattermost versions 5.34.0 to 7.1.9, 7.2.0 to 7.8.4, and 7.9.0 to 7.9.3 are affected by CVE-2023-2808.
How can the CVE-2023-2808 vulnerability be fixed?
To fix the CVE-2023-2808 vulnerability, it is recommended to update Mattermost to a version that is not affected by the vulnerability.

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version/mattermost mattermost/5.34.0
version/mattermost mattermost/7.2.0
version/mattermost mattermost/7.9.0

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