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Mattermost Confluence Plugin version <1.5.0 fails to enforce authentication of the user to the Mattermost instance which allows unauthenticated attackers to access subscription details without via API call to GET subscription endpoint.

CVE-2025-49221 is a security vulnerability identified in the Mattermost Confluence Plugin versions prior to 1.5.0. The vulnerability is classified under CWE-862, which pertains to missing authorization. Specifically, the plugin fails to enforce authentication checks for users accessing the Mattermost instance when making API calls to the GET subscription endpoint. This flaw allows unauthenticated attackers to retrieve subscription details without any credentials or user interaction. The vulnerability is network exploitable (AV:N) but requires high attack complexity (AC:H), meaning that an attacker must have a detailed understanding of the plugin's API and possibly the environment to exploit it successfully. No privileges are required (PR:N), and no user interaction is needed (UI:N). The impact is limited to confidentiality (C:L), with no impact on integrity or availability. The vulnerability does not have known exploits in the wild as of the publication date (August 11, 2025). The absence of authentication enforcement means that sensitive subscription information could be exposed, potentially revealing subscription plans, user counts, or billing details, which could be leveraged for further reconnaissance or social engineering attacks. However, the scope is limited to the Mattermost Confluence Plugin, which is an integration component between Mattermost and Atlassian Confluence, used primarily for collaboration and communication within organizations. The CVSS score is 3.7, indicating a low severity level due to limited impact and high complexity of exploitation.

Detailed information about CVE-2025-49221: CWE-862: Missing Authorization in Mattermost Mattermost Confluence Plugin affecting Mattermost Mattermost Confluence 

CVE-2025-49221: CWE-862: Missing Authorization in Mattermost Mattermost Confluence Plugin - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-49221: CWE-862: Missing Authorization in Mattermost Mattermost Confluence Plugin

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