{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.5.0"
              },
              {
                "fixed": "1.1.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "8b33cef6989687b8724e028e9f91f7617fbe9844"
            },
            {
              "fixed": "685e23efc81afd9bc921d4afa984fff34c4b7e55"
            },
            {
              "fixed": "56ab8464d4375fa52db806148a06cce126ad481d"
            }
          ],
          "repo": "https://github.com/phenixdigital/phoenix_storybook",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-55hg-8qxv-qj4p"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-94"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8467.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "e35379dfe2ef1a71b141899e36f431017c55265d"
          },
          {
            "fixed": "56ab8464d4375fa52db806148a06cce126ad481d"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Code Injection vulnerability in phenixdigital phoenix_storybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation.\n\nThe psb-assign WebSocket event handler in 'Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive':handle_event/3 accepts arbitrary attribute names and values from unauthenticated clients. These values are passed to 'Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers':handle_set_variation_assign/3, which stores them verbatim. When rendering, 'Elixir.PhoenixStorybook.Rendering.ComponentRenderer':attributes_markup/1 interpolates binary attribute values directly into a HEEx template string as name=\"\u003cval\u003e\" without escaping double quotes or HEEx expression delimiters. An attacker can supply a value containing a closing quote followed by a HEEx expression block (e.g. foo\" injected={EXPR} bar=\"), which causes EXPR to be treated as an inline Elixir expression. The resulting template is compiled via EEx.compile_string/2 and executed via Code.eval_quoted_with_env/3 with full Kernel imports and no sandbox, giving the attacker arbitrary code execution on the server.\n\nThis issue affects phoenix_storybook from 0.5.0 before 1.1.0.",
  "id": "CVE-2026-8467",
  "modified": "2026-07-08T05:35:59.059255647Z",
  "published": "2026-05-20T13:35:29.018Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-8467.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-8467"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8467.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-55hg-8qxv-qj4p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8467"
    },
    {
      "type": "FIX",
      "url": "https://github.com/phenixdigital/phoenix_storybook/commit/56ab8464d4375fa52db806148a06cce126ad481d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/phenixdigital/phoenix_storybook"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground"
}