Home

Description

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint

PUBLISHED Reserved 2025-10-15 | Published 2025-11-13 | Updated 2025-11-13 | 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

10.11.0 (semver)
affected

10.5.0 (semver)
affected

11.0.0
unaffected

10.11.4
unaffected

10.5.12
unaffected

Credits

Xiangyu Guo finder

References

mattermost.com/security-updates

cve.org (CVE-2025-11777)

nvd.nist.gov (CVE-2025-11777)

Download JSON