Unauthorized channel file upload
Priority LOW 20CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-284.
Summary
Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.0, 9.8.x <= 9.8.2 fail to enforce permissions which allows a guest user with read access to upload files to a channel.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00278 20th percentileScored 2026-11-07
Fix Partial Mattermost (Mattermost): 9.11.0, 9.9.2, 9.5.8 +2github.com/mattermost/mattermost/server/v8 (Go): 9.5.8, 9.10.1, 9.9.2 +1Red Hat: 1 without a fix
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 | 9.9.0 – 9.9.1; 9.5.0 – 9.5.7; 9.10.0; 9.8.0 – 9.8.2 | 9.11.0, 9.9.2, 9.5.8, 9.10.1, 9.8.3 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.5.0 to before 9.5.8 | 9.5.8 | Patch available | GHSA-2jhx-w3vc-w59g |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.10.0 to before 9.10.1 | 9.10.1 | Patch available | GHSA-2jhx-w3vc-w59g |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.9.0 to before 9.9.2 | 9.9.2 | Patch available | GHSA-2jhx-w3vc-w59g |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.8.0 to before 9.8.3 | 9.8.3 | Patch available | GHSA-2jhx-w3vc-w59g |
- Mattermost VendorMattermost Affected 9.9.0 – 9.9.1; 9.5.0 – 9.5.7; 9.10.0; 9.8.0 – 9.8.2 Fixed in 9.11.0, 9.9.2, 9.5.8, 9.10.1, 9.8.3 Patch available CNA
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.5.0 to before 9.5.8 Fixed in 9.5.8 Patch available GHSA-2jhx-w3vc-w59g
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.10.0 to before 9.10.1 Fixed in 9.10.1 Patch available GHSA-2jhx-w3vc-w59g
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.9.0 to before 9.9.2 Fixed in 9.9.2 Patch available GHSA-2jhx-w3vc-w59g
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.8.0 to before 9.8.3 Fixed in 9.8.3 Patch available GHSA-2jhx-w3vc-w59g
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 9.5.0 to before 9.5.8; 9.8.0 to before 9.8.3; 9.9.0 to before 9.9.2 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:9.10.0:*:*:*:*:*:*:* | 9.10.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.5.0 to before 9.5.8; 9.8.0 to before 9.8.3; 9.9.0 to before 9.9.2 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:9.10.0:*:*:*:*:*:*:* Versions 9.10.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 9.11.0, 9.9.2, 9.5.8, 9.10.1, 9.8.3
- Fix · GHSA-2jhx-w3vc-w59g github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.5.8 Advisory →
- Fix · GHSA-2jhx-w3vc-w59g github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.10.1 Advisory →
- Fix · GHSA-2jhx-w3vc-w59g github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.9.2 Advisory →
- Fix · GHSA-2jhx-w3vc-w59g github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.8.3 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
Not affected: 5 products
- Red Hat Advanced Cluster Security 4
- Red Hat Ceph Storage 5
- Red Hat Ceph Storage 6
- Red Hat Ceph Storage 7
- Red Hat OpenShift GitOps
Timeline
- 2026-10-02 Threatist record created from CVE-2024-43780
- 2026-10-03 Alias added: GHSA-2jhx-w3vc-w59g
References
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-2024-43780 · CVE Program
- CVE-2024-43780 · NVD
- FIRST EPSS
- GHSA-2jhx-w3vc-w59g · GitHub Advisory Database · CC BY 4.0
- CVE-2024-43780 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences