Vulnerability DatabaseCVE-2025-49222
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CVE-2025-49222
August 21, 2025
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.
Affected Packages
github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.5.0 <v10.5.9
Fix Suggestion:
Update to version v10.5.9
github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.8.0 <v10.8.4
Fix Suggestion:
Update to version v10.8.4
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.8.0 <v10.8.4
Fix Suggestion:
Update to version v10.8.4
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.5.0 <v10.5.9
Fix Suggestion:
Update to version v10.5.9
github.com/mattermost/mattermost (GO):
Affected version(s) >=v9.11.0 <v9.11.18
Fix Suggestion:
Update to version v9.11.18
github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.9.0 <v10.9.3
Fix Suggestion:
Update to version v10.9.3
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.9.0 <v10.9.3
Fix Suggestion:
Update to version v10.9.3
github.com/mattermost/mattermost (GO):
Affected version(s) =v10.10.0 <v10.10.1
Fix Suggestion:
Update to version v10.10.1
github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v9.11.0 <v9.11.18
Fix Suggestion:
Update to version v9.11.18
github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.10.0 <v10.10.1
Fix Suggestion:
Update to version v10.10.1
Related Resources (5)
https://github.com/mattermost/mattermost
https://github.com/advisories/GHSA-q453-638c-h4mr
https://pkg.go.dev/vuln/GO-2025-3904
https://mattermost.com/security-updates
https://nvd.nist.gov/vuln/detail/CVE-2025-49222
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CVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Unrestricted Upload of File with Dangerous Type
CWE-434
EPSS
Base Score:
0.04