What is the severity of GHSA-w6xh-c82w-h997?

The vulnerability GHSA-w6xh-c82w-h997 has a high severity rating due to the potential for denial-of-service attacks.

How do I fix GHSA-w6xh-c82w-h997?

To fix GHSA-w6xh-c82w-h997, upgrade Mattermost to version 10.2.1, 10.1.4, 10.0.4, or 9.11.6 depending on your current version.

Which versions of Mattermost are affected by GHSA-w6xh-c82w-h997?

Mattermost versions 10.2.0 and below, 10.1.3 and below, 10.0.3 and below, and 9.11.5 and below are affected by GHSA-w6xh-c82w-h997.

What type of attack can GHSA-w6xh-c82w-h997 facilitate?

GHSA-w6xh-c82w-h997 can facilitate denial-of-service attacks by crafting posts with uncastable attachment fields.

Is there a workaround for GHSA-w6xh-c82w-h997?

There is no known workaround for GHSA-w6xh-c82w-h997; upgrading to the recommended versions is the only solution.

Vulnerability/
GHSA-w6xh-c82w-h997

medium

6.5

CWE

1287

16/1/2025

GHSA-w6xh-c82w-h997

First published: Thu Jan 16 2025(Updated: )

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel.

Affected Software	Affected Version	How to fix
go/github.com/mattermost/mattermost/server/v8	<8.0.0-20241127161322-25ff7a3779a5	8.0.0-20241127161322-25ff7a3779a5
go/github.com/mattermost/mattermost/server/v8	>=9.11.0<=9.11.5	9.11.6
go/github.com/mattermost/mattermost/server/v8	>=10.0.0<=10.0.3	10.0.4
go/github.com/mattermost/mattermost/server/v8	>=10.1.0<=10.1.3	10.1.4
go/github.com/mattermost/mattermost/server/v8	>=10.2.0<10.2.1	10.2.1

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Reference Links

Frequently Asked Questions

What is the severity of GHSA-w6xh-c82w-h997?
The vulnerability GHSA-w6xh-c82w-h997 has a high severity rating due to the potential for denial-of-service attacks.
How do I fix GHSA-w6xh-c82w-h997?
To fix GHSA-w6xh-c82w-h997, upgrade Mattermost to version 10.2.1, 10.1.4, 10.0.4, or 9.11.6 depending on your current version.
Which versions of Mattermost are affected by GHSA-w6xh-c82w-h997?
Mattermost versions 10.2.0 and below, 10.1.3 and below, 10.0.3 and below, and 9.11.5 and below are affected by GHSA-w6xh-c82w-h997.
What type of attack can GHSA-w6xh-c82w-h997 facilitate?
GHSA-w6xh-c82w-h997 can facilitate denial-of-service attacks by crafting posts with uncastable attachment fields.
Is there a workaround for GHSA-w6xh-c82w-h997?
There is no known workaround for GHSA-w6xh-c82w-h997; upgrading to the recommended versions is the only solution.

collector/github-advisory-latest
source/GitHub
alias/GHSA-w6xh-c82w-h997
alias/CVE-2025-20621
agent/software-canonical-lookup
agent/references
agent/weakness
agent/last-modified-date
agent/severity
agent/softwarecombine
agent/type
agent/description
agent/first-publish-date
agent/event
agent/source
agent/tags
collector/github-advisory
package-manager/go

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Frequently Asked Questions

What is the severity of GHSA-w6xh-c82w-h997?
The vulnerability GHSA-w6xh-c82w-h997 has a high severity rating due to the potential for denial-of-service attacks.
How do I fix GHSA-w6xh-c82w-h997?
To fix GHSA-w6xh-c82w-h997, upgrade Mattermost to version 10.2.1, 10.1.4, 10.0.4, or 9.11.6 depending on your current version.
Which versions of Mattermost are affected by GHSA-w6xh-c82w-h997?
Mattermost versions 10.2.0 and below, 10.1.3 and below, 10.0.3 and below, and 9.11.5 and below are affected by GHSA-w6xh-c82w-h997.
What type of attack can GHSA-w6xh-c82w-h997 facilitate?
GHSA-w6xh-c82w-h997 can facilitate denial-of-service attacks by crafting posts with uncastable attachment fields.
Is there a workaround for GHSA-w6xh-c82w-h997?
There is no known workaround for GHSA-w6xh-c82w-h997; upgrading to the recommended versions is the only solution.