CVE-2024-39837
Malicious remote can create arbitrary channels
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Malicious remote can create arbitrary channels
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled.
- Record
CVE-2024-39837- CVSS 3.1
- 3.8 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2024-2667
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled.
- Record
EUVD-2024-2667- CVSS 3.1
- 3.8 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vvpg-55p7-5h8w
Mattermost did not properly restrict channel creation
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled.
- Record
GHSA-vvpg-55p7-5h8w- CVSS 3.1
- 3.8 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
NVD
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled.
- Record
CVE-2024-39837- CVSS 3.1
- 3.8 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N - CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
OSV
Malicious remote can create arbitrary channels
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled.
- Record
CVE-2024-39837- CVSS 3.1
- 3.8 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
OSVGHSA-vvpg-55p7-5h8w
Mattermost did not properly restrict channel creation
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled.
- Record
GHSA-vvpg-55p7-5h8w- CVSS 3.1
- 3.8 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
OSVBIT-mattermost-2024-39837 No score
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled.
- Record
BIT-mattermost-2024-39837- Updated
- 2026-11-02
OSVGO-2024-3032 No score
Mattermost did not properly restrict channel creation in github.com/mattermost/mattermost-server
Mattermost did not properly restrict channel creation in github.com/mattermost/mattermost-server
- Record
GO-2024-3032- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/mattermost/mattermost/server/v8Go |
9.5.0 up to 9.5.7 | 9.5.7 |
github.com/mattermost/mattermost/server/v8Go |
9.9.0 to 9.9.0 | 9.9.1 |
github.com/mattermost/mattermost/server/v8Go |
before 8.0.0-20240626164322-c758cecaf30c | 8.0.0-20240626164322-c758cecaf30c |
github.com/mattermost/mattermost-serverGo |
9.9.0 to 9.9.0 | 9.9.1 |
github.com/mattermost/mattermost-server/v5Go |
before 5.3.2-0.20240626164322-c758cecaf30c | 5.3.2-0.20240626164322-c758cecaf30c |
github.com/mattermost/mattermost-server/v6Go |
before 6.0.0-20240626164322-c758cecaf30c | 6.0.0-20240626164322-c758cecaf30c |
github.com/mattermost/mattermost-serverGo |
9.5.0 up to 9.5.7 | 9.5.7 |
mattermostBitnami |
9.5.0 up to 9.5.7, 9.9.0 to 9.9.0 | 9.5.7 |
github.com/mattermost/mattermost/server/v8Go |
9.9.0 up to 9.9.1 | 9.9.1 |
github.com/mattermost/mattermost-serverGo |
9.9.0 up to 9.9.1 | 9.9.1 |
Show 4 moreShow less
| Package | Affected | Fixed |
|---|---|---|
github.com/mattermost/mattermost-serverGo |
9.5.0+incompatible up to 9.5.7+incompatible, 9.9.0+incompatible up to 9.9.1+incompatible | 9.5.7+incompatible9.9.1+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-2024-39837 is a low vulnerability (CVSS 3.8) in Mattermost, published August 1, 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 9.5.7.