GHSA-cmc8-222c-vqp9
Mattermost failed to properly validate that the channel that comes from the sync message is a shared channel
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | >= 9.5.0, < 9.5.7 | 9.5.7 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 9.7.0, < 9.7.6 | 9.7.6 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 9.8.0, < 9.8.2 | 9.8.2 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 9.9.0, < 9.9.1 | 9.9.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to properly validate that the channel that comes from the sync message is a shared channel, when shared channels are enabled, which allows a malicious remote to add users to arbitrary teams and channels
References
External links from the advisory. They lead to third-party sites.