Vulnerability · Published Oct 16, 2025 · Assigned by Mattermost
CVE-2025-41410Slack import bypasses email verification for team access controls
Medium 5.4
In plain English
A medium-severity missing authorization in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Mattermost versions 10.10.x <= 10.10.2, 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to validate email ownership during Slack import process which allows attackers to create verified user accounts with arbitrary email domains via malicious Slack import data to bypass email-based team access restrictions
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.10.3 | GHSA-3q4q-wqm6-hvf3 |
| Go | github.com/mattermost/mattermost-server | 10.5.11 | GHSA-3q4q-wqm6-hvf3 |
| Go | github.com/mattermost/mattermost-server | 10.11.3 | GHSA-3q4q-wqm6-hvf3 |
| Go | github.com/mattermost/mattermost-server | 10.10.3+incompatible, 10.11.3+incompatible, 10.5.11+incompatible | GO-2025-4029 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-4029 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-4029 |
| Go | github.com/mattermost/mattermost/server/v8 | no fix listed | GO-2025-4029 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250822083415-01b95392a450 | GHSA-3q4q-wqm6-hvf3 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.10.0 – through 10.10.210.5.0 – through 10.5.1010.11.0 – through 10.11.2 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N