Malicious imports can lead to Denial of Service
Priority LOW 31CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-400.
Summary
The legacy Slack import feature in Mattermost version 6.7.0 and earlier fails to properly limit the sizes of imported files, which allows an authenticated attacker to crash the server by importing large files via the Slack import REST API.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00882 59th 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:*:*:*:*:*:*:*:* | up to 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 up to 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-2022-2406
- 2026-10-03 Alias added: GHSA-fv5r-cw7f-79jm
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-2022-2406 · CVE Program
- CVE-2022-2406 · NVD
- FIRST EPSS
- GHSA-fv5r-cw7f-79jm · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences