DevSpace UI Server WebSocket CheckOrigin does not validate source

{
  "id": "329577641b7caa4bd35023c314b6882dffaf2739b5b7470171275cb2238dcd77",
  "url": "https://osv.dev/vulnerability/CVE-2026-42283",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DevSpace UI Server WebSocket CheckOrigin does not validate source",
    "summary": "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.",
    "evidence": "osv:CVE-2026-42283",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-42283",
      "aliases": [
        "CVE-2026-42283",
        "GHSA-hqwm-7x7x-8379",
        "GO-2026-5433"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/devspace-sh/devspace",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a91772ba91f0b8c8cac08e83580a8202dfe00746"
                },
                {
                  "fixed": "7f272dcf90653fa9b42bc4347f7f3f9a52b0e8b5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "6.3.21"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:devspace:devspace:6.3.20:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.3.20"
                      },
                      {
                        "last_affected": "6.3.20"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6.3.20",
            "v6.3.20",
            "v6.3.19"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42283.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.266592032Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42283.json",
        "https://github.com/devspace-sh/devspace/security/advisories/GHSA-hqwm-7x7x-8379",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42283"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200",
          "CWE-306"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42283.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42283",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 506661,
  "published_at": "2026-05-14T15:44:22.499+00:00"
}