| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0+incompatible, < 10.11.14+incompatible≥ 11.5.0+incompatible, < 11.5.2+incompatible< 5.3.2-0.20260310115442-5a1ea95044dc | 10.11.14+incompatible11.5.2+incompatible5.3.2-0.20260310115442-5a1ea95044dc |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | ≥ 10.11.0, < 10.11.14≥ 11.5.0, < 11.5.2< 8.0.0-20260310115442-5a1ea95044dall versions | 10.11.1411.5.28.0.0-20260310115442-5a1ea95044d |
| mattermost server | ≥ 10.11.0, < 10.11.14≥ 11.5.0, < 11.5.2 | 10.11.1411.5.2 |
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
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