CVE-2024-43780
Unauthorized channel file upload
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Unauthorized channel file upload
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.
- Record
CVE-2024-43780- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2024-2464
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.
- Record
EUVD-2024-2464- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2jhx-w3vc-w59g
Mattermost allows guest user with read access to upload files to a channel
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.
- Record
GHSA-2jhx-w3vc-w59g- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2024-43780- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
OSV
Unauthorized channel file upload
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.
- Record
CVE-2024-43780- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
OSVGHSA-2jhx-w3vc-w59g
Mattermost allows guest user with read access to upload files to a channel
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.
- Record
GHSA-2jhx-w3vc-w59g- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
OSVBIT-mattermost-2024-43780 No score
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.
- Record
BIT-mattermost-2024-43780- Updated
- 2026-11-02
OSVGO-2024-3089 No score
Mattermost allows guest user with read access to upload files to a channel in github.com/mattermost/mattermost-server
Mattermost allows guest user with read access to upload files to a channel in github.com/mattermost/mattermost-server
- Record
GO-2024-3089- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/mattermost/mattermost/server/v8Go |
9.5.0 up to 9.5.8 | 9.5.8 |
github.com/mattermost/mattermost/server/v8Go |
9.10.0 up to 9.10.1 | 9.10.1 |
github.com/mattermost/mattermost/server/v8Go |
9.9.0 up to 9.9.2 | 9.9.2 |
github.com/mattermost/mattermost/server/v8Go |
9.8.0 up to 9.8.3 | 9.8.3 |
mattermostBitnami |
9.5.0 up to 9.5.8, 9.8.0 up to 9.8.3, 9.9.0 up to 9.9.2, 9.10.0 to 9.10.0 | 9.5.89.8.39.9.2 |
github.com/mattermost/mattermost-serverGo |
9.5.0+incompatible up to 9.5.8+incompatible, 9.8.0+incompatible up to 9.8.3+incompatible, 9.9.0+incompatible up to 9.9.2+incompatible, 9.10.0+incompatible up to 9.10.1+incompatible | 9.5.8+incompatible9.8.3+incompatible9.9.2+incompatible9.10.1+incompatible |
github.com/mattermost/mattermost-server/v5Go |
All versions | None known |
github.com/mattermost/mattermost-server/v6Go |
All versions | None known |
github.com/mattermost/mattermost/server/v8Go |
All versions | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-43780 is a medium vulnerability (CVSS 4.3) in Mattermost, published August 22, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. Fixed in github.com/mattermost/mattermost/server/v8 9.5.8.