CVE-2026-3115
MEDIUM EPSS 13.8%
Published Mar 26, 20263mo ago · Modified Jun 17, 20261w ago
4.3 CVSS 3.1
Published Mar 26, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago
Description
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
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity None
Availability None
Threat Intelligence
EPSS Exploit Probability
13.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-863 Incorrect Authorization Authorization
Affected Products 4
| Vendor | Product | Version | Range |
|---|---|---|---|
| mattermost | mattermost_server | * | ≥10.11.0 – <10.11.11 |
| mattermost | mattermost_server | * | ≥11.2.0 – <11.2.3 |
| mattermost | mattermost_server | * | ≥11.3.0 – <11.3.2 |
| mattermost | mattermost_server | 11.4.0 | any |
References 1
- mattermost.com https://mattermost.com/security-updates
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.