Overview
This report details a high-severity vulnerability in the Mattermost Confluence Plugin. Identified as CVE-2025-52931, the vulnerability impacts versions earlier than 1.5.0. It is particularly significant as a successfully exploited vulnerability could potentially lead to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-52931
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: A successful exploit could lead to system compromise or data leakage.
Affected Products
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Product | Affected Versions
Mattermost Confluence Plugin | <1.5.0 How the Exploit Works
The vulnerability stems from the Mattermost Confluence Plugin’s failure to handle unexpected request bodies. An attacker can exploit this flaw by consistently hitting the update channel subscription endpoint with an invalid request body. This action crashes the plugin, potentially leading to system compromise or data leakage.
Conceptual Example Code
The following demonstrates a conceptual example of how the vulnerability might be exploited:
POST /api/v4/plugins/confluence/update_channel_subscription HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "invalid_request_body": "..." }In this example, the attacker sends a POST request with an invalid body to the ‘update_channel_subscription’ endpoint, causing the Mattermost Confluence Plugin to crash.
Recommendations
Users of the Mattermost Confluence Plugin should upgrade to version 1.5.0 or later immediately. If not possible, we recommend using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation method.
