What’s Vulnerable › Vulnerabilities

CVE-2025-13321: Mattermost Desktop App logging sensitive information and fails to clear data on server deletion

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-17 · updated 2026-10-13
• Weakness: CWE-532

Description

Mattermost Desktop App versions <6.0.0 fail to sanitize sensitive information from Mattermost logs and clear data on server deletion which allows an attacker with access to the users system to gain access to potentially sensitive information via reading the application logs.

Affected products

• Mattermost Desktop: before 6.0.0 — fixed in 6.0.0

How to fix

Upgrade to a fixed version: Mattermost Desktop 6.0.0. Check the vendor advisory for mitigations.

References

• https://mattermost.com/security-updates

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