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CVE-2026-42283— DevSpace UI Server WebSocket CheckOrigin does not validate source

Quick assessment

Affected
devspace-sh devspace
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DevSpace是DevSpace公司的一款使用Kubernetes进行云原生开发的客户端开发者工具。 DevSpace 6.3.21之前版本存在信息泄露漏洞，该漏洞源于UI服务器WebSocket默认接受来自所有源的连接，可能导致恶意网站利用浏览器建立跨源WebSocket连接到ws://127.0.0.1:8090。

CVSS 7.7 · High EPSS 0.15% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
devspace-sh devspace < 6.3.21 affected
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I. Basic Information for CVE-2026-42283

Vulnerability Information
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Vulnerability Title
DevSpace UI Server WebSocket CheckOrigin does not validate source
Source: CVE Program / CVE List V5
Vulnerability Description
DevSpace is a client-only developer tool for cloud-native development with Kubernetes. Prior to 6.3.21, DevSpace's UI server WebSocket accepts connections from all origins by default, and therefore several endpoints are exposed via this WebSocket. When a developer runs the DevSpace UI and at the same time uses a browser to access the internet, a malicious website they visit can use their browser to establish a cross-origin WebSocket connection to ws://127.0.0.1:8090. This vulnerability is fixed in 6.3.21.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
DevSpace 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DevSpace是DevSpace公司的一款使用Kubernetes进行云原生开发的客户端开发者工具。 DevSpace 6.3.21之前版本存在信息泄露漏洞，该漏洞源于UI服务器WebSocket默认接受来自所有源的连接，可能导致恶意网站利用浏览器建立跨源WebSocket连接到ws://127.0.0.1:8090。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
devspace-sh devspace < 6.3.21 -

II. Public POCs for CVE-2026-42283

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III. Intelligence Information for CVE-2026-42283

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Vendor Advisories for CVE-2026-42283 (1)

IV. Related Vulnerabilities

Same weakness: CWE-306

V. Comments for CVE-2026-42283

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