CVE-2025-55300

Komari Allows Cross-site WebSocket Hijacking

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.

Category

8.6
CVSS
Severity: High
CVSS 4.0 •
EPSS 0.33%
Affected: komari-monitor komari
Published at:
Updated at:

References

Link Tags
https://github.com/komari-monitor/komari/security/advisories/GHSA-q355-h244-969h
https://github.com/komari-monitor/komari/commit/d31d12e59febce100ab0285b93338f09aa5d6cb1

Frequently Asked Questions

What is the severity of CVE-2025-55300?
CVE-2025-55300 has been scored as a high severity vulnerability.
How to fix CVE-2025-55300?
To fix CVE-2025-55300, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-55300 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-55300 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-55300?
CVE-2025-55300 affects komari-monitor komari.
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