Cross-Site WebSocket Hijacking in Komari Server Monitoring Tool
CVE-2025-55300

8.6HIGH

Key Information:

Vendor

Komari-monitor

Status
Komari
Vendor
CVE Published:
18 August 2025

What is CVE-2025-55300?

Komari, a self-hosted server monitoring tool, is vulnerable to Cross-Site WebSocket Hijacking (CSWSH) due to the lack of origin checking in its WebSocket upgrader prior to version 1.0.4-fix1. This vulnerability enables attackers to exploit authenticated user sessions by sending unauthorized requests to the terminal WebSocket endpoint, potentially leading to remote code execution. Users are advised to upgrade to version 1.0.4-fix1 to mitigate this security risk.

Affected Version(s)

komari < 1.0.4-fix1

References

https://github.com/komari-monitor/komari/security/advisor...
x_refsource_CONFIRM
https://github.com/komari-monitor/komari/commit/d31d12e59...
x_refsource_MISC

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-55300 : Cross-Site WebSocket Hijacking in Komari Server Monitoring Tool