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The CVE-2025-XXXXX vulnerability in Mattermost arises due to insufficient sanitization of filenames during archive extraction. Authenticated users can exploit this by uploading specially crafted archive files containing path traversal sequences (e.g., ../../../malicious.sh) in filenames. When the archive is extracted, the server places files in unintended filesystem locations due to inadequate path validation. This flaw is exploitable only when `FileSettings.EnableFileAttachments` and `FileSettings.ExtractContent` are enabled (default configuration). Successful exploitation may lead to arbitrary file overwrites, privilege escalation, or remote code execution (RCE) if executable files are written to accessible directories.
DailyCVE Form:
Platform: Mattermost
Version: <=10.5.5, <=9.11.15
Vulnerability: Path Traversal
Severity: Critical
Date: Jun 20, 2025
Prediction: Patch by Jul 10, 2025
What Undercode Say:
Check Mattermost version: curl -s http://localhost:8065/api/v4/config/client | grep "Version" Exploit PoC (simulated): zip exploit.zip "../../../malicious.php" mattermost-upload exploit.zip
How Exploit:
1. Authenticate to Mattermost.
2. Craft ZIP with traversal filenames.
3. Upload archive; server extracts to `/../../../`.
Protection from this CVE:
- Disable
ExtractContent. - Apply patches: v10.5.6, v9.11.16.
- Restrict file upload permissions.
Impact:
- RCE via file overwrite.
- System compromise.
- Data integrity loss.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
