Cross-session PubSub topic injection via URL parameter in phoenix_storybook

{
  "id": "71e63e2c23f741114e1fa669003111ccf2ceac38f9f1ec05cbc71c6ce0db12b7",
  "url": "https://osv.dev/vulnerability/CVE-2026-47068",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Cross-session PubSub topic injection via URL parameter in phoenix_storybook",
    "summary": "Authorization Bypass Through User-Controlled Key vulnerability in phenixdigital phoenix_storybook allows cross-session PubSub topic injection via a URL query parameter. 'Elixir.PhoenixStorybook.Story.ComponentIframeLive':handle_params/3 in lib/phoenix_storybook/live/story/component_iframe_live.ex reads a PubSub topic directly from params[\"topic\"] and broadcasts {:component_iframe_pid, self()} on it with no check that the topic belongs to the requesting session. The shared PhoenixStorybook.PubSub is used to coordinate playground LiveViews with their iframes: a playground subscribes to a session-specific topic and uses the received iframe pid to direct subsequent control messages (variation state, theme switches, extra-assign payloads) via send/2. Because the iframe trusts the query parameter, an attacker who loads /storybook/iframe/?topic= causes their iframe process pid to be announced on the victim's topic. The victim's playground then addresses its private messages to the attacker's iframe process. This issue affects phoenix_storybook from 0.4.0 before 1.1.0.",
    "evidence": "osv:CVE-2026-47068",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-47068",
      "aliases": [
        "CVE-2026-47068",
        "EEF-CVE-2026-47068",
        "GHSA-mrhx-6pw9-q5fh"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/phenixdigital/phoenix_storybook",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8c2c97b0f505780fee4069988bf86736f51d35d7"
                },
                {
                  "fixed": "6ee03f1c738d4436dde1b066cf65c80663d489f5"
                },
                {
                  "introduced": "2514a3dd7bdd29d0d1e3cd4021ec92fc37410cdd"
                },
                {
                  "fixed": "685e23efc81afd9bc921d4afa984fff34c4b7e55"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "8c2c97b0f505780fee4069988bf86736f51d35d7"
                      },
                      {
                        "fixed": "6ee03f1c738d4436dde1b066cf65c80663d489f5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0.4.0"
                      },
                      {
                        "fixed": "1.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "6ee03f1c738d4436dde1b066cf65c80663d489f5"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.0.0",
            "v0.9.3",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.3",
            "v0.8.1",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.6.4",
            "v0.6.3",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.7",
            "v0.5.6",
            "v0.5.5",
            "v0.5.4",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.5",
            "v0.4.4",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47068.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.472959389Z",
      "provider": "osv",
      "references": [
        "https://cna.erlef.org/cves/CVE-2026-47068.html",
        "https://github.com",
        "https://osv.dev/vulnerability/EEF-CVE-2026-47068",
        "https://repo.hex.pm",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47068.json",
        "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-mrhx-6pw9-q5fh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-47068",
        "https://github.com/phenixdigital/phoenix_storybook/commit/6ee03f1c738d4436dde1b066cf65c80663d489f5",
        "https://github.com/phenixdigital/phoenix_storybook"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "EEF",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47068.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-47068",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496237,
  "published_at": "2026-05-20T13:35:33.215+00:00"
}