CVE-2025-27715
Mattermost fail to prompt for explicit approval before adding a team admin to a private channel in github.com/mattermost/mattermost-server
3.3
LOW
CVSS 3.1
EPSS 0.17%
Description
Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.
How to fix CVE-2025-27715
To remediate CVE-2025-27715, upgrade the affected package to a fixed version below.
- —upgrade to 10.0.0 or later
- —upgrade to 9.11.9+incompatible or later
- —no fix listed
- —no fix listed
- —upgrade to 9.11.9 or later
- —no fix listed
Is CVE-2025-27715 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (6)
- >= 9.11.0, < 10.0.0
- >= 9.11.0+incompatible, < 9.11.9+incompatible
- from 0
- from 0
- >= 9.11.0, < 9.11.9
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.3 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N |