Vulnerability · Published Jun 11, 2025 · Assigned by Mattermost
CVE-2025-4128Mattermost Guest User Information Disclosure Vulnerability
Low 3.1
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 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.1Low
Exploit odds (30 days)0.2%top 87.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mattermost versions 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/{team_id}.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.5.5+incompatible, 9.11.14+incompatible | GO-2025-3757 |
| Go | github.com/mattermost/mattermost-server | 10.5.5 | GHSA-jwhw-xf5v-qgxc |
| Go | github.com/mattermost/mattermost-server | 9.11.14 | GHSA-jwhw-xf5v-qgxc |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-3757 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-3757 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250422131222-701ddc896a10 | GHSA-jwhw-xf5v-qgxc |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250422131222-701ddc896a10 | GO-2025-3757 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.5.0 – through 10.5.49.11.0 – through 9.11.13 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N