CVE-2026-7521
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Path Traversal in Mattermost Server

Publication date: 2026-07-28

Last updated on: 2026-07-28

Assigner: Mattermost, Inc.

Description
Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to verify file deletion path which allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint.. Mattermost Advisory ID: MMSA-2026-00666

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Meta Information

Published
2026-07-28
Last Modified
2026-07-28
Generated
2026-07-28
AI Q&A
2026-07-28
EPSS Evaluated
N/A
NVD
CVE-2026-7521
EUVD
EUVD-2026-49852

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mattermost mattermost to 11.8.0 (inc)
mattermost mattermost to 11.7.3 (inc)
mattermost mattermost to 11.6.5 (inc)
mattermost mattermost to 10.11.20 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

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Executive Summary

This vulnerability affects Mattermost versions 11.8.0 and below, 11.7.3 and below, 11.6.5 and below, and 10.11.20 and below. It allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint due to improper verification of file deletion paths.

Impact Analysis

An attacker with admin privileges could delete critical system files, leading to service disruption, data loss, or potential unauthorized access to sensitive information. The impact severity is moderate with a CVSS score of 5.5, indicating limited confidentiality impact but high availability impact.

Compliance Impact

This vulnerability could lead to unauthorized file deletion, potentially violating data integrity and availability requirements under GDPR and HIPAA. Organizations may face compliance violations if sensitive data or logs are deleted, impacting audit trails and data protection measures.

Mitigation Strategies

Update Mattermost to a patched version (11.8.1 or later, 11.7.4 or later, 11.6.6 or later, or 10.11.21 or later) to address the file deletion vulnerability.

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