CVE-2025-53514

Unexpected Input to Server Webhook endpoint Causes DoS in Mattermost Confluence Plugin

CVSS 5.9 MEDIUMEPSS 0.3%CWE-754

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.9EPSS 0.3%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 handle unexpected request body which allows attackers to crash the plugin via constant hit to server webhook endpoint with an invalid request body.

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

Affected products

Mattermost · Mattermost Confluence Plugin

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References

https://mattermost.com/security-updates