VDB
CVE-2026-3115
CVE-2026-3115
PUBLISHED
CVSS 4.300000190734863 MEDIUM
Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to apply view restrictions when retrieving group member IDs, which allows authenticated guest users to enumerate user IDs outside their allowed visibility scope via the group retrieval endpoint.. Mattermost Advisory ID: MMSA-2026-00594
EPSS 0.01% · 2.3th percentile
Risk Scores
CVSS 3.1
4.300000190734863
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS Score
0.01%
2.3th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.11.11, 11.3.2, 11.3.2 |
| github.com | mattermost/mattermost/server/v8 | 10.11.0-rc1, 11.4.0, 8.0.0-20260105080200-d27a2195068d |
| mattermost | mattermost_server | 11.3.0, 10.11.0, 11.2.0 |
Exploit Intelligence
- MMSA-2026-00594 (circl)
Timeline
- Mar 26, 2026 CVE Published
- Mar 27, 2026 Coalition ESS Score
- Mar 27, 2026 Security Advisory
- Mar 29, 2026 Security Advisory
- Mar 31, 2026 CVE Updated
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score
- May 24, 2026 EPSS Score
References
- MMSA-2026-00594 vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-3115 advisory
- https://github.com/mattermost/mattermost package