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Description

Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in arbitrary filesystem directories.

PUBLISHED Reserved 2025-07-22 | Published 2025-08-21 | Updated 2025-08-21 | Assigner Mattermost




MEDIUM: 6.8CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Problem types

CWE-434: Unrestricted Upload of File with Dangerous Type

Product status

Default status
unaffected

10.8.0
affected

10.5.0
affected

9.11.0
affected

10.9.0
affected

10.10.0
affected

10.11.0
unaffected

10.8.4
unaffected

10.5.9
unaffected

9.11.18
unaffected

10.9.3
unaffected

10.10.1
unaffected

Credits

daw10 finder

References

mattermost.com/security-updates

cve.org (CVE-2025-49222)

nvd.nist.gov (CVE-2025-49222)

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