Unauthorized Channel Subscription in Mattermost Confluence Plugin
CVE-2025-53910

4MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost Confluence Plugin
Vendor
CVE Published:
11 August 2025

What is CVE-2025-53910?

The Mattermost Confluence Plugin prior to version 1.5.0 contains an access control flaw. The plugin does not properly verify user permissions for accessing channels, enabling malicious users to create channel subscriptions without appropriate rights. This vulnerability can be exploited via API calls to the edit channel subscription endpoint, leading to potential unauthorized access to sensitive channel content.

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Affected Version(s)

Mattermost Confluence Plugin 0 < 1.5.0

Mattermost Confluence Plugin 1.5.0

References

https://mattermost.com/security-updates

CVSS V3.1

Score:
4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Lorenzo Gallegos
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