CVE-2026-4055
Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server
4.3
MEDIUM
CVSS 3.1
EPSS 0.15%
Description
Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server
How to fix CVE-2026-4055
To remediate CVE-2026-4055, upgrade the affected package to a fixed version below.
- Go/github.com/mattermost/mattermost-server—no fix listed
- —no fix listed
- —no fix listed
- —upgrade to 8.0.0-20260320113102-f2b3d1c6a945 or later
- —upgrade to 8.0.0-20260320113102-f2b3d1c6a945 or later
Is CVE-2026-4055 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0
- from 0
- from 0
- >= 8.0.0-20260304132957-9f2616376582, < 8.0.0-20260320113102-f2b3d1c6a945
- >= 8.0.0-20260304132957-9f2616376582, < 8.0.0-20260320113102-f2b3d1c6a945
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |