Scheme validation bypass in Phoenix.LiveView.Utils leads to XSS via <.link>

{
  "id": "557f344b194d477aeea26853cb2b92402dfcb5731eb2b07436bafec11f7089cb",
  "url": "https://osv.dev/vulnerability/CVE-2026-58228",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Scheme validation bypass in Phoenix.LiveView.Utils leads to XSS via <.link>",
    "summary": "Cross-site scripting vulnerability in phoenixframework phoenix_live_view allows an attacker to bypass URL scheme validation and execute JavaScript in a victim's browser session. The Phoenix.LiveView.Utils.valid_destination!/2 and Phoenix.LiveView.Utils.valid_live_navigation_destination!/2 functions in lib/phoenix_live_view/utils.ex rely on an internal uri_scheme/1 helper that only detects a scheme when the input's first byte is an ASCII letter. Inputs beginning with an ASCII control character or space fall through to a nil-returning clause, causing the URL to be treated as a safe relative path. Standard browsers implement the WHATWG URL parser, which strips leading C0 control and space characters before parsing. As a result, an input such as \" javascript:alert(1)\" is passed unchanged into <.link href={...}> and, when clicked, is parsed by the browser as a javascript: URL that executes attacker-controlled script in the victim's session. Applications that render user-supplied URLs (for example profile links, redirect targets, or external references) via <.link href={...}> are affected. This issue affects phoenix_live_view: from 1.2.2 before 1.2.7.",
    "evidence": "osv:CVE-2026-58228",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-58228",
      "aliases": [
        "CVE-2026-58228",
        "EEF-CVE-2026-58228",
        "GHSA-5cgh-g58j-m9cq"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/phoenixframework/phoenix_live_view",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4b63216ae68886db99cf7772af23372d76c40e7e"
                },
                {
                  "fixed": "86165533e311469a1b62093fd182d9d874de8106"
                },
                {
                  "introduced": "5789176010e4456a28c7d84b9f19ff9d7b4a93ee"
                },
                {
                  "fixed": "2570f650c2cc6f2ff925f7f498516c3053ebd9b0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4b63216ae68886db99cf7772af23372d76c40e7e"
                      },
                      {
                        "fixed": "86165533e311469a1b62093fd182d9d874de8106"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.2.2"
                      },
                      {
                        "fixed": "1.2.7"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "86165533e311469a1b62093fd182d9d874de8106"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.2.6",
            "v1.2.5",
            "v1.2.4",
            "v1.2.3",
            "v1.2.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58228.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.296582192Z",
      "provider": "osv",
      "references": [
        "https://cna.erlef.org/cves/CVE-2026-58228.html",
        "https://github.com",
        "https://osv.dev/vulnerability/EEF-CVE-2026-58228",
        "https://repo.hex.pm",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58228.json",
        "https://github.com/phoenixframework/phoenix_live_view/security/advisories/GHSA-5cgh-g58j-m9cq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-58228",
        "https://github.com/phoenixframework/phoenix_live_view/commit/86165533e311469a1b62093fd182d9d874de8106",
        "https://github.com/phoenixframework/phoenix_live_view"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "EEF",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58228.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-58228",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498327,
  "published_at": "2026-07-13T18:04:30.636+00:00"
}