CVE-2026-8467

Estado: AplazadaCrítica (9.5)—

Code Injection vulnerability in phenixdigital phoenix_storybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation.

The 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.

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When rendering, 'Elixir.PhoenixStorybook.Rendering.ComponentRenderer':attributes_markup/1 interpolates binary attribute values directly into a HEEx template string as name="<val>" 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.

This issue affects phoenix_storybook from 0.5.0 before 1.1.0.

CVSS

Versión: 4.0
Vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 9.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 2.06%
Percentil entre todas las CVEs puntuadas: 81
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access95 %
Impacto principalT1059 Command and Scripting Interpreterexecution95 %

Red sin autenticación (AV:N, PR:N, UI:N) + inyección de código en plantilla HEEx compilada con Code.eval_quoted_with_env sin sandbox: ejecución de comandos Elixir arbitraria en el servidor.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account Management Vulnerability Scanning Restrict Web-Based Content Network Segmentation Limit Software Installation Limit Access to Resource Over Network

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Phenixdigital — Phoenix Storybook^AI

CWE

CWE-94

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-8467",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-8467",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-21T13:57:52.803277Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 9.5,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/phenixdigital/phoenix_storybook",
          "vendor": "phenixdigital",
          "modules": [
            "Elixir.PhoenixStorybook.Rendering.ComponentRenderer",
            "Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive",
            "Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers"
          ],
          "product": "phoenix_storybook",
          "versions": [
            {
              "status": "affected",
              "version": "0.5.0",
              "lessThan": "1.1.0",
              "versionType": "semver"
            }
          ],
          "packageURL": "pkg:hex/phoenix_storybook",
          "packageName": "phoenix_storybook",
          "programFiles": [
            "lib/phoenix_storybook/rendering/component_renderer.ex",
            "lib/phoenix_storybook/live/story/playground_preview_live.ex",
            "lib/phoenix_storybook/helpers/extra_assigns_helpers.ex"
          ],
          "collectionURL": "https://repo.hex.pm",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "'Elixir.PhoenixStorybook.Rendering.ComponentRenderer':attributes_markup/1"
            },
            {
              "name": "'Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive':handle_event/3"
            },
            {
              "name": "'Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers':handle_set_variation_assign/3"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/phenixdigital/phoenix_storybook",
          "vendor": "phenixdigital",
          "modules": [
            "Elixir.PhoenixStorybook.Rendering.ComponentRenderer",
            "Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive",
            "Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers"
          ],
          "product": "phoenix_storybook",
          "versions": [
            {
              "status": "affected",
              "version": "e35379dfe2ef1a71b141899e36f431017c55265d",
              "lessThan": "56ab8464d4375fa52db806148a06cce126ad481d",
              "versionType": "git"
            }
          ],
          "packageURL": "pkg:github/phenixdigital/phoenix_storybook",
          "packageName": "phenixdigital/phoenix_storybook",
          "programFiles": [
            "lib/phoenix_storybook/rendering/component_renderer.ex",
            "lib/phoenix_storybook/live/story/playground_preview_live.ex",
            "lib/phoenix_storybook/helpers/extra_assigns_helpers.ex"
          ],
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "'Elixir.PhoenixStorybook.Rendering.ComponentRenderer':attributes_markup/1"
            },
            {
              "name": "'Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive':handle_event/3"
            },
            {
              "name": "'Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers':handle_set_variation_assign/3"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-05-20T14:17:04.283",
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-8467.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/phenixdigital/phoenix_storybook/commit/56ab8464d4375fa52db806148a06cce126ad481d",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-55hg-8qxv-qj4p",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-8467",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-55hg-8qxv-qj4p",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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=\"<val>\" 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."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de inyección de código en phenixdigital phoenix_storybook permite la ejecución remota de código no autenticada a través de la interpolación de valores de atributos no saneados en la generación de plantillas HEEx.\n\nEl gestor de eventos WebSocket psb-assign en 'Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive':handle_event/3 acepta nombres y valores de atributos arbitrarios de clientes no autenticados. Estos valores se pasan a 'Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers':handle_set_variation_assign/3, que los almacena textualmente. Al renderizar, 'Elixir.PhoenixStorybook.Rendering.ComponentRenderer':attributes_markup/1 interpola valores de atributos binarios directamente en una cadena de plantilla HEEx como name=\"<val>\" sin escapar las comillas dobles o los delimitadores de expresión HEEx. Un atacante puede proporcionar un valor que contenga una comilla de cierre seguida de un bloque de expresión HEEx (p. ej., foo\" injected={EXPR} bar=\"), lo que hace que EXPR sea tratado como una expresión Elixir en línea. La plantilla resultante se compila a través de EEx.compile_string/2 y se ejecuta a través de Code.eval_quoted_with_env/3 con importaciones completas del Kernel y sin sandbox, lo que le da al atacante ejecución de código arbitrario en el servidor.\n\nEste problema afecta a phoenix_storybook desde 0.5.0 antes de 1.1.0."
    }
  ],
  "lastModified": "2026-07-23T12:10:00.110",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}