Vulnerability · Published Mar 21, 2025 · Assigned by Mattermost
CVE-2025-27715Auto-Enrollment of Team Admins into Private Channels without explicit consent
Low 3.3
In plain English
A low-severity incorrect authorization in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.2%top 87.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 9.11.9+incompatible | GO-2025-3555 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-3555 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-3555 |
| Go | github.com/mattermost/mattermost/server/v8 | no fix listed | GO-2025-3555 |
| Go | github.com/mattermost/mattermost/server/v8 | 9.11.9 | GHSA-cw7q-5cgc-h3h9 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 9.11.0 – through 9.11.8 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N