Vulnerability DatabaseCVE-2025-6227

CVE-2025-6227:
vulnerability analysis and mitigation

Overview

Mattermost versions 10.5.x <= 10.5.7 and 9.11.x <= 9.11.16 contain a security vulnerability related to token negotiation during invite acceptance. The vulnerability was disclosed on July 18, 2025, and is tracked as CVE-2025-6227. This security issue affects the Mattermost collaboration platform's invite system (NVD).

Technical details

The vulnerability stems from a failure to properly negotiate a new token when accepting an invite. This weakness is classified as CWE-522 (Insufficiently Protected Credentials). The vulnerability has received a CVSS v3.1 base score of 2.2 (LOW) with the vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N, indicating network accessibility with high attack complexity and high privileges required (NVD).

Impact

When exploited, this vulnerability allows an attacker who successfully intercepts both the invite and password to send synchronization payloads to the server that originally created the invite through the REST API. The impact is limited to low integrity compromise with no confidentiality or availability effects (NVD).

Mitigation and workarounds

Users should upgrade to versions newer than Mattermost 10.5.7 for the 10.5.x series or versions newer than 9.11.16 for the 9.11.x series to address this vulnerability (Mattermost Security).