What is CVE-2025-8285?

CVE-2025-8285 is a medium-severity vulnerability in Mattermost Confluence, classified under Missing Authorization. CVSS score: 4.0/10. Published 2025-08-11.

How severe is CVE-2025-8285?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Is CVE-2025-8285 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Mattermost Confluence

CVE-2025-8285

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription end…

Vulnerability class: Broken Access Control

EPSS: 0.002 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

Mattermost Confluence
Mattermost Confluence Plugin — versions 0, 1.5.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-8285?: CVE-2025-8285 is a medium-severity vulnerability in Mattermost Confluence, classified under Missing Authorization. CVSS score: 4.0/10. Published 2025-08-11.
How severe is CVE-2025-8285?: Medium severity. CVSS v3 base score is 4.0 out of 10.
Is CVE-2025-8285 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.