Description
Mattermost versions 10.11.x <= 10.11.5, 11.0.x <= 11.0.4, 10.12.x <= 10.12.2 fail to invalidate remote cluster invite tokens when using the legacy (version 1) protocol or when the confirming party does not provide a refreshed token, which allows an attacker who has obtained an invite token to authenticate as the remote cluster and perform limited actions on shared channels even after the invitation has been legitimately confirmed.
Details
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| github.com/mattermost/mattermost | โ | โ |
| github.com/mattermost/mattermost-server | โ | โ |
| github.com/mattermost/mattermost-server/v5 | โ | โ |
| github.com/mattermost/mattermost-server/v6 | โ | โ |
| github.com/mattermost/mattermost/server/v8 | โ | โ |
| mattermost-server | 11.0.0 | 11.0.5 |
References
Similar Threats
- High CVE-2026-6347
- Medium CVE-2026-2461
- High CVE-2025-13523
- Medium CVE-2025-12689
- Low CVE-2025-13352
Vulnerability Monitoring
Stay informed about vulnerabilities in your stack
BotEraser monitors your WordPress installation and notifies you when software you use appears in our vulnerability database.
Set Up Free Alerts โNo credit card required ยท Results in minutes
ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.