CVE-2025-53857

Lack of Authorization on Get Channel Subscriptions for Autocomplete in Mattermost Confluence Plugin

CVSS 3.7 LOWEPSS 0.2%CWE-862

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 3.7EPSS 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 get channel subscription details without proper access to the channel via API call to the GET autocomplete/GetChannelSubscriptions endpoint.

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

Affected products

Mattermost · Mattermost Confluence Plugin

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References

https://mattermost.com/security-updates