Bug 2451793 (CVE-2026-3115) - CVE-2026-3115 mattermost: Mattermost: Information disclosure via group retrieval endpoint
Summary: CVE-2026-3115 mattermost: Mattermost: Information disclosure via group retrie...
Keywords:
Status: NEW
Alias: CVE-2026-3115
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-26 17:03 UTC by OSIDB Bzimport
Modified: 2026-03-26 19:28 UTC (History)
0 users

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Description OSIDB Bzimport 2026-03-26 17:03:00 UTC 
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
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