File Deletion Vulnerability in Mattermost by Mattermost
CVE-2026-7521

5.5MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
28 July 2026

What is CVE-2026-7521?

The Mattermost platform has a significant issue where specific versions fail to properly verify the file deletion path. This vulnerability enables an administrator with SAML system-console write permissions to delete arbitrary files outside the intended config directory via the remove file endpoint. This flaw could lead to unauthorized file manipulation and poses a risk to the overall stability and security of the server environment.

Affected Version(s)

Mattermost 11.8.0

Mattermost 11.7.0 <= 11.7.3

Mattermost 11.6.0 <= 11.6.5

References

https://mattermost.com/security-updates
vendor-advisory

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

winfunc
.