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Description

Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.

PUBLISHED Reserved 2025-06-18 | Published 2025-07-18 | Updated 2025-07-18 | Assigner Mattermost




LOW: 2.2CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

Problem types

CWE-522: Insufficiently Protected Credentials

Product status

Default status
unaffected

10.5.0 (semver)
affected

9.11.0 (semver)
affected

10.9.0
unaffected

10.5.8
unaffected

9.11.17
unaffected

Credits

Miguel de la Cruz finder

References

mattermost.com/security-updates

cve.org (CVE-2025-6227)

nvd.nist.gov (CVE-2025-6227)

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