CVE-2026-8467 (GCVE-0-2026-8467)

Vulnerability from cvelistv5 – Published: 2026-05-20 13:35 – Updated: 2026-05-22 04:38
VLAI
Title
Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground
Summary
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. 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.
Severity
9.5 (Critical)
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
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
EEF
References
Impacted products
Vendor Product Version
phenixdigital phoenix_storybook Affected: 0.5.0 , < 1.1.0 (semver)
    cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*
 Create a notification for this product.
phenixdigital phoenix_storybook Affected: e35379dfe2ef1a71b141899e36f431017c55265d , < 56ab8464d4375fa52db806148a06cce126ad481d (git)
    cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*
 Create a notification for this product.
Credits
Nick Mykhailyshyn Cenk Kücük Christian Blavier Jonatan Männchen
Show details on NVD website
To clipboard 

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\"\u0027Elixir.PhoenixStorybook.Rendering.ComponentRenderer\u0027:attributes_markup/1\"}, {\"name\": \"\u0027Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive\u0027:handle_event/3\"}, {\"name\": \"\u0027Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers\u0027: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\": \"\u0027Elixir.PhoenixStorybook.Rendering.ComponentRenderer\u0027:attributes_markup/1\"}, {\"name\": \"\u0027Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive\u0027:handle_event/3\"}, {\"name\": \"\u0027Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers\u0027:handle_set_variation_assign/3\"}]}], \"references\": [{\"url\": \"https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-55hg-8qxv-qj4p\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-8467.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-8467\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/phenixdigital/phoenix_storybook/commit/56ab8464d4375fa52db806148a06cce126ad481d\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"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 \u0027Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive\u0027:handle_event/3 accepts arbitrary attribute names and values from unauthenticated clients. These values are passed to \u0027Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers\u0027:handle_set_variation_assign/3, which stores them verbatim. When rendering, \u0027Elixir.PhoenixStorybook.Rendering.ComponentRenderer\u0027: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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eCode Injection vulnerability in phenixdigital phoenix_storybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation.\u003c/p\u003e\u003cp\u003eThe \u003ctt\u003epsb-assign\u003c/tt\u003e WebSocket event handler in \u003ctt\u003e\u0027Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive\u0027:handle_event/3\u003c/tt\u003e accepts arbitrary attribute names and values from unauthenticated clients. These values are passed to \u003ctt\u003e\u0027Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers\u0027:handle_set_variation_assign/3\u003c/tt\u003e, which stores them verbatim. When rendering, \u003ctt\u003e\u0027Elixir.PhoenixStorybook.Rendering.ComponentRenderer\u0027:attributes_markup/1\u003c/tt\u003e interpolates binary attribute values directly into a HEEx template string as \u003ctt\u003ename=\\\"\u0026lt;val\u0026gt;\\\"\u003c/tt\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. \u003ctt\u003efoo\\\" injected={EXPR} bar=\\\"\u003c/tt\u003e), which causes \u003ctt\u003eEXPR\u003c/tt\u003e to be treated as an inline Elixir expression. The resulting template is compiled via \u003ctt\u003eEEx.compile_string/2\u003c/tt\u003e and executed via \u003ctt\u003eCode.eval_quoted_with_env/3\u003c/tt\u003e with full \u003ctt\u003eKernel\u003c/tt\u003e imports and no sandbox, giving the attacker arbitrary code execution on the server.\u003c/p\u003e\u003cp\u003eThis issue affects phoenix_storybook from 0.5.0 before 1.1.0.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-94\", \"description\": \"CWE-94 Improper Control of Generation of Code (\u0027Code Injection\u0027)\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.1.0\", \"versionStartIncluding\": \"0.5.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-05-22T04:38:10.372Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-8467\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-22T04:38:10.372Z\", \"dateReserved\": \"2026-05-13T11:44:40.790Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-05-20T13:35:29.018Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.