File Upload Validation Flaw in Mattermost Products by Mattermost
CVE-2025-49222

6.8MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
21 August 2025

What is CVE-2025-49222?

Mattermost versions exhibit a vulnerability related to upload type validation during remote cluster upload sessions. This issue allows system administrators to upload non-attachment file types via shared channels. Consequently, these files may be handled in arbitrary filesystem directories, posing a risk of unintended file exposure and system integrity compromise. It's crucial for users and administrators to be aware of this vulnerability and implement necessary measures to mitigate potential risks.

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Affected Version(s)

Mattermost 10.8.0 <= 10.8.3

Mattermost 10.5.0 <= 10.5.8

Mattermost 9.11.0 <= 9.11.17

References

https://mattermost.com/security-updates

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

daw10
JSON
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