CVSS 3.1
4.3 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NCVE-2024-39839
Medium (4.3) in mattermost mattermost server. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 9.5.7, 9.7.6, 9.8.2.
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow users to set their own remote username, when shared channels were enabled, which allows a user on a remote to set their remote username prop to an arbitrary string, which would be then synced to the local server as long as the user hadn't been synced before.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-31)
- CWE
- CWE-284
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-vg6q-84p8-qvqh | Go | github.com/mattermost/mattermost/server/v8 | >=9.5.0 <9.5.7 | 9.5.7 |
| GHSA-vg6q-84p8-qvqh | Go | github.com/mattermost/mattermost/server/v8 | >=9.7.0 <9.7.6 | 9.7.6 |
| GHSA-vg6q-84p8-qvqh | Go | github.com/mattermost/mattermost/server/v8 | >=9.8.0 <9.8.2 | 9.8.2 |
| GHSA-vg6q-84p8-qvqh | Go | github.com/mattermost/mattermost/server/v8 | >=9.9.0 <9.9.1 | 9.9.1 |
| GO-2024-3024 | Go | github.com/mattermost/mattermost-server | >=9.5.0+incompatible <9.5.7+incompatible >=9.7.0+incompatible <9.7.6+incompatible >=9.8.0+incompatible <9.8.2+incompatible >=9.9.0+incompatible <9.9.1+incompatible | 9.5.7+incompatible, 9.7.6+incompatible, 9.8.2+incompatible, 9.9.1+incompatible |
| GO-2024-3024 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2024-3024 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2024-3024 | Go | github.com/mattermost/mattermost/server/v8 | all versions | no fix published |