CVSS 3.1
2.7 lowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:NCVE-2026-27769
Low (2.7) in mattermost mattermost server. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost-server 8.0.0-20260316060126-bc1a2b34b1f9.
Mattermost versions 10.11.x <= 10.11.12 fail to validate whether users were correctly owned by the correct Connected Workspace which allows a malicious remote server connected using the Conntexted Workspaces feature to change the displayed status of local users via the Connected Workspaces API.. Mattermost Advisory ID: MMSA-2026-00603
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-31)
- CWE
- CWE-862
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-mxxh-fmjq-j6x4 | Go | github.com/mattermost/mattermost-server | >=8.0.0-20250721062209-4952acea88ce <8.0.0-20260316060126-bc1a2b34b1f9 | 8.0.0-20260316060126-bc1a2b34b1f9 |
| GO-2026-5522 | Go | github.com/mattermost/mattermost-server | all versions | no fix published |