CVE-2025-49222

MediumCVSS 6.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.8/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N

Weakness enumeration

CWE-434

Affected software

Vendor	Product	Versions
Mattermost	Mattermost	>= 10.8.0, <= 10.8.3; >= 10.5.0, <= 10.5.8; >= 9.11.0, <= 9.11.17; >= 10.9.0, <= 10.9.2; >= 10.10.0, <= 10.10.0

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Aug 21, 2025
Last modified: Jun 17, 2026
NVD status: Analyzed

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