CVE-2025-49221 in Confluence Plugin
Summary
by MITRE • 08/11/2025
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.
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Analysis
by VulDB Data Team • 09/25/2025
The vulnerability identified as CVE-2025-49221 affects the Mattermost Confluence Plugin version 1.5.0 and earlier, representing a critical authentication bypass flaw that undermines the security posture of integrated collaboration environments. This issue stems from insufficient validation of user credentials when accessing subscription details through the plugin's API endpoints, creating an avenue for unauthorized access to sensitive information.
The technical flaw manifests in the plugin's failure to properly authenticate API requests to the GET subscription endpoint, allowing attackers to bypass the standard authentication mechanisms that should verify user identity before granting access to subscription data. This authentication weakness operates at the application layer and specifically targets the plugin's API interface, where legitimate users would normally need valid Mattermost credentials to access subscription details. The vulnerability creates a direct path for unauthenticated attackers to retrieve subscription information without proper authorization, effectively eliminating the need for valid user credentials.
The operational impact of this vulnerability extends beyond simple data exposure, as subscription details often contain sensitive information about user access permissions, service configurations, and potentially business-critical data about team collaborations and communication patterns. Attackers exploiting this vulnerability could gain insights into organizational communication structures, identify active users, and potentially escalate their access to other systems within the Mattermost ecosystem. The implications are particularly severe in enterprise environments where Confluence and Mattermost integration is used for internal collaboration and knowledge management.
Security controls such as access control lists and authentication enforcement mechanisms are fundamentally compromised by this vulnerability, which aligns with CWE-287 (Improper Authentication) and represents a direct violation of the principle of least privilege. The ATT&CK framework categorizes this as a privilege escalation technique where attackers can gain unauthorized access to resources without proper authentication, potentially enabling further malicious activities within the network. Organizations using affected plugin versions face significant risk of data leakage and unauthorized system access.
The recommended remediation involves upgrading to Mattermost Confluence Plugin version 1.5.0 or later, which implements proper authentication enforcement for API endpoints. Additionally, organizations should conduct immediate security assessments of their existing plugin installations and implement network-level controls to monitor for unauthorized API access attempts. Regular security audits of integrated applications and mandatory credential rotation practices should be enforced to prevent similar vulnerabilities from emerging in other components of the collaboration infrastructure.