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Description

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to sanitize team email addresses to be visible only to Team Admins, which allows any authenticated user to view team email addresses via the GET /api/v4/channels/{channel_id}/common_teams endpoint

PUBLISHED Reserved 2025-10-31 | Published 2025-11-27 | Updated 2025-11-28 | Assigner Mattermost




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Product status

Default status
unaffected

11.0.0 (semver)
affected

10.12.0 (semver)
affected

10.11.0 (semver)
affected

10.5.0 (semver)
affected

11.1.0
unaffected

11.0.3
unaffected

10.12.2
unaffected

10.11.5
unaffected

10.5.13
unaffected

Credits

hainguyen0207 finder

References

mattermost.com/security-updates

cve.org (CVE-2025-12559)

nvd.nist.gov (CVE-2025-12559)

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