GHSA-ph22-fw5m-w2q9
Mattermost allows attackers to spoof permalink embeds
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20260123211116-9efe617be8b8 | 8.0.0-20260123211116-9efe617be8b8 |
| Go | github.com/mattermost/mattermost-server | < 5.3.2-0.20260123211116-9efe617be8b8 | 5.3.2-0.20260123211116-9efe617be8b8 |
| Go | github.com/mattermost/mattermost-server | >= 10.11.0-rc1, < 10.11.11 | 10.11.11 |
| Go | github.com/mattermost/mattermost-server | >= 11.2.0-rc1, < 11.2.3 | 11.2.3 |
| Go | github.com/mattermost/mattermost-server | >= 11.3.0-rc1, < 11.3.1 | 11.3.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint. Mattermost Advisory ID: MMSA-2025-00569
References
External links from the advisory. They lead to third-party sites.