Guest accounts can list all public channels
Priority LOW 21CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure, Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200 and CWE-863.
Summary
The Guest account feature in Mattermost version 6.7.0 and earlier fails to properly restrict the permissions, which allows a guest user to fetch a list of all public channels in the team, in spite of not being part of those channels.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00599 48th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 6.3.8; 6.4.x; 6.7.x 6.7.0; 6.5.x – 6.5.1; 6.6.x – 6.6.1 | — | No fix listed | CNA |
- Mattermost VendorMattermost Affected up to 6.3.8; 6.4.x; 6.7.x 6.7.0; 6.5.x – 6.5.1; 6.6.x – 6.6.1 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:* | before 6.3.8; 6.4.0 – 6.5.1 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost:6.6.0:*:*:*:*:*:*:* | 6.6.0 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost:6.6.1:*:*:*:*:*:*:* | 6.6.1 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost:6.7.0:*:*:*:*:*:*:* | 6.7.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:* Versions before 6.3.8; 6.4.0 – 6.5.1 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost:6.6.0:*:*:*:*:*:*:* Versions 6.6.0 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost:6.6.1:*:*:*:*:*:*:* Versions 6.6.1 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost:6.7.0:*:*:*:*:*:*:* Versions 6.7.0 Vulnerable ·Mattermost
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2022-2408
- 2026-10-03 Alias added: GHSA-3q29-6c6h-84hh
References
Advisory 1
More Mattermost vulnerabilities
- TI-2024-26695 Malicious remote can invite itself to an arbitrary local channel CVSS 3.1CRITICAL 9.6
- TI-2023-02056 Oauth authorization codes do not expire when deauthorizing an oauth2 app CVSS 3.1CRITICAL 9.1
- TI-2019-15069 An issue was discovered in Mattermost Mobile Apps before 1.26.0. CVSS 3.1CRITICAL 9.1
- TI-2024-26233 Malicious remote can add users to arbitrary teams and channels CVSS 3.1HIGH 8.7
- TI-2024-26746 Permanently local data deletion by malicious remote CVSS 3.1HIGH 8.7
- TI-2023-06508 Injection in Mattermost CVSS 3.1HIGH 8.8
Sources
- CVE-2022-2408 · CVE Program
- CVE-2022-2408 · NVD
- FIRST EPSS
- GHSA-3q29-6c6h-84hh · GitHub Advisory Database · CC BY 4.0
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