CVE-2025-55073
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.
- CVSS 3.1
- 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-25)
- CWE
- CWE-306
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-ff85-qw3h-g9vp | Go | github.com/mattermost/mattermost-server | >=10.11.0 <10.11.4 | 10.11.4 |
| GHSA-ff85-qw3h-g9vp | Go | github.com/mattermost/mattermost-server | >=10.5.0 <10.5.12 | 10.5.12 |
| GHSA-ff85-qw3h-g9vp | Go | github.com/mattermost/mattermost-server | >=10.12.0 <10.12.1 | 10.12.1 |
| GHSA-ff85-qw3h-g9vp | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250929212932-a41db04d2746 | 8.0.0-20250929212932-a41db04d2746 |
| GO-2025-4129 | Go | github.com/mattermost/mattermost-server | >=10.5.0+incompatible <10.5.12+incompatible >=10.11.0+incompatible <10.11.4+incompatible >=10.12.0+incompatible <10.12.1+incompatible | 10.5.12+incompatible, 10.11.4+incompatible, 10.12.1+incompatible |
| GO-2025-4129 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2025-4129 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2025-4129 | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250929212932-a41db04d2746 | 8.0.0-20250929212932-a41db04d2746 |