GHSA-m5rv-56xx-hfc6
Mattermost fails to properly handle very long passwords
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20260129164748-7201f42d955f | 8.0.0-20260129164748-7201f42d955f |
| Go | github.com/mattermost/mattermost-server | < 5.3.2-0.20260129164748-7201f42d955f | 5.3.2-0.20260129164748-7201f42d955f |
| 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 properly handle very long passwords, which allows an attacker to overload the server CPU and memory via executing login attempts with multi-megabyte passwords. Mattermost Advisory ID: MMSA-2026-00587
References
External links from the advisory. They lead to third-party sites.