CVE-2026-2463
Medium
Description
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to filter invite IDs based on user permissions, which allows regular users to bypass access control restrictions and register unauthorized accounts via leaked invite IDs during team creation.. Mattermost Advisory ID: MMSA-2025-00565
SeverityMedium
CVSS4.3
Exploit probability—
Product
Mattermost Server
PublishedMar 16, 2026
First seenMar 16, 2026
Weakness typeCWE-862Missing authorization
How to fix
Update
- mattermost mattermost_server10.11.11, 11.2.3, 11.3.1 or later
- github.com/mattermost/mattermost/server/v88.0.0-20260105134819-cc427af41b2a or later
- github.com/mattermost/mattermost-server5.3.2-0.20260105134819-cc427af41b2a, 10.11.11, 11.2.3, 11.3.1, 10.11.11+incompatible, 11.2.3+incompatible, 11.3.1+incompatible or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.11.0 ≤ v < 10.11.11, 11.2.0 ≤ v < 11.2.3, 11.3.0 ≤ v < 11.3.1 | 10.11.11, 11.2.3, 11.3.1 |
| github.com/mattermost/mattermost/server/v8Go | v < 8.0.0-20260105134819-cc427af41b2a | 8.0.0-20260105134819-cc427af41b2a |
| github.com/mattermost/mattermost-serverGo | v < 5.3.2-0.20260105134819-cc427af41b2a, 10.11.0-rc1 ≤ v < 10.11.11, 11.2.0-rc1 ≤ v < 11.2.3, 11.3.0-rc1 ≤ v < 11.3.1, 10.11.0-rc1+incompatible ≤ v < 10.11.11+incompatible, 11.2.0-rc1+incompatible ≤ v < 11.2.3+incompatible, 11.3.0-rc1+incompatible ≤ v < 11.3.1+incompatible | 5.3.2-0.20260105134819-cc427af41b2a, 10.11.11, 11.2.3, 11.3.1, 10.11.11+incompatible, 11.2.3+incompatible, 11.3.1+incompatible |
| github.com/mattermost/mattermost-server/v5Go | No range specified | — |
| github.com/mattermost/mattermost-server/v6Go | No range specified | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.