Warning: Critical Vulnerability in Mattermost (CVE-2025-4981), Patch Immediately!

A critical Mattermost vulnerability (CVE-2025-4981) allows authenticated users to upload specially crafted archives containing path traversal sequences that bypass extraction sanitization, enabling arbitrary file writes and potential remote code execution; the issue affects default deployments with file attachments and content extraction enabled and is rated CVSS 9.9. Immediate actions recommended are patching to the fixed version and increasing monitoring/detection for suspicious activity.