CVE-2023-5194: 
Mattermost vulnerability analysis and mitigation

CVE-2023-5194 is a security vulnerability discovered in Mattermost that affects the user permission validation system. The vulnerability was identified on September 26, 2023, and involves improper validation of permissions when demoting and deactivating users, specifically allowing system/user managers to demote or deactivate other managers (NVD, CVE).

The vulnerability is classified as CWE-863 (Incorrect Authorization) and has received varying CVSS v3.1 severity ratings. The National Vulnerability Database (NVD) assessed it with a Base Score of 4.3 (MEDIUM) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N, while Mattermost, Inc. rated it as 2.7 (LOW) with the vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L (NVD).

The vulnerability affects Mattermost versions from 7.0.0 up to (excluding) 7.8.10 and versions from 8.0.0 up to (excluding) 8.1.1. When exploited, it allows system or user managers to improperly demote or deactivate other managers, potentially disrupting organizational hierarchy and access controls (NVD).

Users are advised to upgrade to Mattermost version 7.8.10 or 8.1.1 or later versions to address this vulnerability. Mattermost has implemented fixes in these versions to properly validate permissions for user demotion and deactivation actions (NVD).