Komari Allows Cross-site WebSocket Hijacking
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| komari-monitor | komari | before 1.0.4-fix1 | 1.0.4-fix1 | Patch available | CNA |
- komari Vendorkomari-monitor Affected before 1.0.4-fix1 Fixed in 1.0.4-fix1 Patch available CNA
Remediation
- Fix · CNA komari (komari-monitor) Fixed in 1.0.4-fix1
Timeline
- 2026-10-02 Threatist record created from CVE-2025-55300
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences