Auth bypass in Mattermost Confluence
CVE-2025-54478
Mattermost Confluence Plugin version <1.5.0 fails to enforce authentication of the user to the Mattermost instance which allows unauthenticated attackers to edit channel subscriptions via API call to the edit channel subscription endpoint.
Vulnerability class: Broken Authentication
EPSS: 0.002 (13.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Mattermost Confluence
- Mattermost Confluence Plugin — versions 0, 1.5.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- responsibledisclosure@mattermost.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-54478?
- CVE-2025-54478 is a high-severity vulnerability in Mattermost Confluence, classified under Missing Authentication for Critical Function. CVSS score: 7.2/10. Published 2025-08-11.
- How severe is CVE-2025-54478?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2025-54478 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.