| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 9.5.0+incompatible, < 9.5.7+incompatible≥ 9.9.0+incompatible, < 9.9.1+incompatible | 9.5.7+incompatible9.9.1+incompatible |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | ≥ 9.5.0, < 9.5.7≥ 9.9.0, < 9.9.1all versions | 9.5.79.9.1 |
| mattermost | = 9.9.0≥ 9.5.0, < 9.5.7 | 9.5.7 |
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly validate synced reactions, when shared channels are enabled, which allows a malicious remote to create arbitrary reactions on arbitrary posts
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