komari-monitor komari up to 1.0.4 Terminal Websocket Endpoint cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in komari-monitor komari up to 1.0.4. Affected is an unknown function of the component Terminal Websocket Endpoint. This manipulation causes cross site scripting. This vulnerability appears as CVE-2025-55300. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in komari-monitor komari up to 1.0.4. Affected by this vulnerability is some unknown processing of the component Terminal Websocket Endpoint. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-55300 since 08/12/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 1.0.4-fix1 eliminates this vulnerability. Applying the patch d31d12e59febce100ab0285b93338f09aa5d6cb1 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-25135). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: komari 1.0.4-fix1
Patch: d31d12e59febce100ab0285b93338f09aa5d6cb1

Timelineinfo

08/12/2025 CVE reserved
08/18/2025 +6 days Advisory disclosed
08/18/2025 +0 days VulDB entry created
08/19/2025 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-q355-h244-969h
Status: Confirmed

CVE: CVE-2025-55300 (🔒)
GCVE (CVE): GCVE-0-2025-55300
GCVE (VulDB): GCVE-100-320473
EUVD: 🔒

Entryinfo

Created: 08/18/2025 21:20
Updated: 08/19/2025 15:01
Changes: 08/18/2025 21:20 (70), 08/19/2025 15:01 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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