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 validate the style of proto supplied to an action's style in post.props.attachments, which allows an attacker to crash the frontend via crafted malicious input.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost/server/v8(Go) | 10.2.0 | 10.2.1 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 10.1.0 | 10.1.4 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 10.0.0 | 10.0.4 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 9.11.0 | 9.11.6 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.0.0-20241127161322-25ff7a3779a5 | N/A |
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