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Description

Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint

PUBLISHED Reserved 2025-09-16 | Published 2025-10-16 | Updated 2025-10-16 | Assigner Mattermost




LOW: 3.1CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

Default status
unaffected

10.5.0 (semver)
affected

10.11.0 (semver)
affected

10.12.0
unaffected

10.5.11
unaffected

10.11.3
unaffected

Credits

lordwillmore finder

References

mattermost.com/security-updates

cve.org (CVE-2025-10545)

nvd.nist.gov (CVE-2025-10545)

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