GHSA-jx93-pf6x-874r
Mattermost doesn't escape some variables that could contain malicious content during error page composition
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.11.0, < 10.11.14 | 10.11.14 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.5.0, < 11.5.2 | 11.5.2 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20260310115442-5a1ea95044d | 8.0.0-20260310115442-5a1ea95044d |
| Go | github.com/mattermost/mattermost-server | < 5.3.2-0.20260310115442-5a1ea95044dc | 5.3.2-0.20260310115442-5a1ea95044dc |
Details
As written in the advisory (Markdown source, shown as plain text).
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attacker with access to edit some site configuration to execute some malicious code via injecting some JS as part of those values.. Mattermost Advisory ID: MMSA-2026-00622
References
External links from the advisory. They lead to third-party sites.