Mattermost Desktop App logging sensitive information and fails to clear data on server deletion
Priority LOW 15CWE-532Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-532.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00119 1st percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 6.0.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mattermost | Mattermost | up to 6.0.0 | 6.0.0 | Patch available | CNA |
| — | mattermost-desktop (npm) | up to 3.6.0 | — | No fix listed | GHSA-g6qx-wq5w-wr8v |
- Mattermost VendorMattermost Affected up to 6.0.0 Fixed in 6.0.0 Patch available CNA
- mattermost-desktop (npm) Vendor— Affected up to 3.6.0 Fixed in — No fix listed GHSA-g6qx-wq5w-wr8v
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:* | before 6.0.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:* Versions before 6.0.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 6.0.0
Timeline
- 2026-10-02 Threatist record created from CVE-2025-13321
- 2026-10-03 Alias added: GHSA-g6qx-wq5w-wr8v
References
More Mattermost Desktop vulnerabilities
- TI-2019-15074 An issue was discovered in Mattermost Desktop App before 4.3.0 on macOS. CVSS 3.1CRITICAL 9.8
- TI-2016-09099 An issue was discovered in Mattermost Desktop App before 3.4.0. CVSS 3.1CRITICAL 9.8
- TI-2019-15079 An issue was discovered in Mattermost Desktop App before 4.2.2. CVSS 3.1HIGH 8.8
- TI-2024-26542 RCE in desktop app in Windows by local attacker CVSS 3.1HIGH 7.8
- TI-2026-05712 Mattermost Desktop App fails to restrict the allow list of domains which NTLM credentials are passed CVSS 3.1HIGH 7.7
- TI-2026-00781 Arbitrary application execution via unvalidated server-controlled URLs in Help menu CVSS 3.1HIGH 7.6
Sources
- CVE-2025-13321 · CVE Program
- CVE-2025-13321 · NVD
- FIRST EPSS
- GHSA-g6qx-wq5w-wr8v · GitHub Advisory Database · CC BY 4.0
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