Description
Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions <=2.4.0 fail to validate plugin bot identity in reaction forwarding which allows attackers to hijack the GitHub reaction feature to make users add reactions to arbitrary GitHub objects via crafted notification posts.
Details
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| github.com/mattermost/mattermost | — | — |
| github.com/mattermost/mattermost-plugin-github | — | — |
| github.com/mattermost/mattermost-server | — | — |
| github.com/mattermost/mattermost-server/v5 | — | — |
| github.com/mattermost/mattermost-server/v6 | — | — |
| github.com/mattermost/mattermost/server/v8 | — | — |
| mattermost-server | 10.11.0 | 10.11.7 |
References
Similar Threats
- High CVE-2026-6347
- Medium CVE-2026-2461
- High CVE-2025-13523
- Medium CVE-2025-12689
- Low CVE-2025-13324
Exploit Protection
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