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CVE-2025-41410GO-2025-4029GHSA-3Q4Q-WQM6-HVF3

Slack import bypasses email verification for team access controls

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 10.5.11+incompatible, 10.10.3+incompatible, 10.11.3+incompatible, 8.0.0-20250822083415-01b95392a450, 10.10.3, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Mattermost Mattermost

    From 10.10.0 · through 10.10.2; From 10.5.0 · through 10.5.10; From 10.11.0 · through 10.11.2

  • github.com/mattermost/mattermost-serverGo

    From 10.5.0+incompatible · fixed in 10.5.11+incompatible; From 10.10.0+incompatible · fixed in 10.10.3+incompatible; From 10.11.0+incompatible · fixed in 10.11.3+incompatible

  • github.com/mattermost/mattermost-server/v5Go

    All versions

  • github.com/mattermost/mattermost-server/v6Go

    All versions

  • github.com/mattermost/mattermost/server/v8Go

    All versions

  • github.com/mattermost/mattermost/server/v8Go

    fixed in 8.0.0-20250822083415-01b95392a450

  • github.com/mattermost/mattermost-serverGo

    From 10.10.0 · fixed in 10.10.3

  • github.com/mattermost/mattermost-serverGo

    From 10.5.0 · fixed in 10.5.11

  • github.com/mattermost/mattermost-serverGo

    From 10.11.0 · fixed in 10.11.3

References 1

mattermost.com