Unauthorized access on archived channels
Priority LOW 24CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.
Summary
Mattermost versions 9.11.x <= 9.11.0, 9.10.x <= 9.10.1, 9.9.x <= 9.9.2 and 9.5.x <= 9.5.8 fail to properly authorize requests when viewing archived channels is disabled, which allows an attacker to retrieve post and file information about archived channels. Examples are flagged or unread posts as well as files.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00221 12th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.0.0, 9.11.1, 9.10.2 +2
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 | 9.11.0; 9.10.0 – 9.10.1; 9.9.0 – 9.9.2; 9.5.0 – 9.5.8 | 10.0.0, 9.11.1, 9.10.2, 9.9.3, 9.5.9 | Patch available | CNA |
- Mattermost VendorMattermost Affected 9.11.0; 9.10.0 – 9.10.1; 9.9.0 – 9.9.2; 9.5.0 – 9.5.8 Fixed in 10.0.0, 9.11.1, 9.10.2, 9.9.3, 9.5.9 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 9.5.0 to before 9.5.9; 9.9.0 to before 9.9.3; 9.10.0 to before 9.10.2 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:9.11.0:-:*:*:*:*:*:* | 9.11.0 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:9.11.0:rc1:*:*:*:*:*:* | 9.11.0 rc1 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:9.11.0:rc2:*:*:*:*:*:* | 9.11.0 rc2 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:9.11.0:rc3:*:*:*:*:*:* | 9.11.0 rc3 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.5.0 to before 9.5.9; 9.9.0 to before 9.9.3; 9.10.0 to before 9.10.2 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:9.11.0:-:*:*:*:*:*:* Versions 9.11.0 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:9.11.0:rc1:*:*:*:*:*:* Versions 9.11.0 rc1 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:9.11.0:rc2:*:*:*:*:*:* Versions 9.11.0 rc2 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:9.11.0:rc3:*:*:*:*:*:* Versions 9.11.0 rc3 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 10.0.0, 9.11.1, 9.10.2, 9.9.3, 9.5.9
Timeline
- 2026-10-02 Threatist record created from CVE-2024-42406
- 2026-10-03 Alias added: GHSA-v53q-gwp7-274v
References
Advisory 1
More Mattermost Server vulnerabilities
- TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
- TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
- TI-2017-14068 An issue was discovered in Mattermost Server before 3.6.2. CVSS 3.1CRITICAL 9.8
- TI-2017-14060 An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. CVSS 3.1CRITICAL 9.8
- TI-2017-14048 An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. CVSS 3.1CRITICAL 9.8
- TI-2025-14360 Arbitrary file read via block duplication in Mattermost Boards CVSS 3.1CRITICAL 9.9
Sources
- CVE-2024-42406 · CVE Program
- CVE-2024-42406 · NVD
- FIRST EPSS
- GHSA-v53q-gwp7-274v · 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