Vulnerability · Published May 14, 2026 · Assigned by GitHub_M

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

High 7.7

In plain English

A high-severity missing authentication in devspace from devspace-sh. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.2%top 95.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/loft-sh/devspace	6.3.21	GHSA-hqwm-7x7x-8379
Go	github.com/loft-sh/devspace	no fix listed	GO-2026-5433

Affected products (as reported)

Vendor	Product	Versions
devspace-sh	devspace	< 6.3.21

Weakness: CWE-306, CWE-200 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

References

https://github.com/devspace-sh/devspace/security/advisories/GHSA-hqwm-7x7x-8379 x_refsource_CONFIRM