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GHSA-w6xh-c82w-h997

Mattermost webapp crash via a crafted post

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-20621

Packages

EcosystemPackageAffectedFixed in
Go github.com/mattermost/mattermost/server/v8 >= 10.2.0, < 10.2.1 10.2.1
Go github.com/mattermost/mattermost/server/v8 >= 10.1.0, < 10.1.4 10.1.4
Go github.com/mattermost/mattermost/server/v8 >= 10.0.0, < 10.0.4 10.0.4
Go github.com/mattermost/mattermost/server/v8 >= 9.11.0, < 9.11.6 9.11.6
Go github.com/mattermost/mattermost/server/v8 < 8.0.0-20241127161322-25ff7a3779a5 8.0.0-20241127161322-25ff7a3779a5

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.