CVE-2025-41410

Slack import bypasses email verification for team access controls

State: Published
Severity: 5.4 Medium
Published: Oct 16, 2025
Updated: Oct 16, 2025
Reserved: Sep 16, 2025

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

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N	Mattermost

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
MattermostMattermost	10.10.0 through 10.10.2Affected 10.5.0 through 10.5.10Affected 10.11.0 through 10.11.2Affected 10.12.0Not affected 10.10.3Not affected 10.5.11Not affected 10.11.3Not affected

References

https://mattermost.com/security-updates

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