CVE-2025-8285

Unauthorized Channel Subscription Creation in Mattermost Confluence Plugin

CVSS 4 MEDIUMEPSS 0.2%CWE-862

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

11 Aug 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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 endpoint.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

Affected products

Mattermost · Mattermost Confluence Plugin

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References

https://mattermost.com/security-updates