Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2025-27715
CVE-2025-27715:
vulnerability analysis and mitigation
Overview
Mattermost versions 9.11.x <= 9.11.8 contain a vulnerability where team admins can join private channels via crafted permalink links without explicit consent. The vulnerability was discovered and disclosed on March 21, 2025, affecting Mattermost Server versions from 9.11.0 up to 9.11.9 (NVD).
Technical details
The vulnerability is classified as an Incorrect Authorization issue (CWE-863) with a CVSS v3.1 base score of 2.7 LOW (AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N) according to NIST, while Mattermost assigned it a slightly higher score of 3.3 LOW (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N) (NVD).
Impact
The vulnerability allows team administrators to bypass the normal approval process and join private channels through specially crafted permalink links, potentially compromising the privacy and access control of private channel content (NVD).
Mitigation and workarounds
The vulnerability has been fixed in Mattermost version 9.11.9. Users are advised to upgrade to this version or later to address the security issue (Vendor Advisory).
Additional resources
Source: This report was generated using AI
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