CVE-2025-55300
High
Description
Komari is a lightweight, self-hosted server monitoring tool designed to provide a simple and efficient solution for monitoring server performance. Prior to 1.0.4-fix1, WebSocket upgrader has disabled origin checking, enabling Cross-Site WebSocket Hijacking (CSWSH) attacks against authenticated users. Any third party website can send requests to the terminal websocket endpoint with browser's cookies, resulting in remote code execution. This vulnerability is fixed in 1.0.4-fix1.
SeverityHigh
CVSS8.6
Exploit probability—
ProductGithub.com/komari-monitor/komari
PublishedAug 18, 2025
First seenAug 18, 2025
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- github.com/komari-monitor/komari0.0.0-20250809073044-53171affcaf0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/komari-monitor/komariGo | v < 0.0.0-20250809073044-53171affcaf0 | 0.0.0-20250809073044-53171affcaf0 |
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