{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-8467", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-05-13T11:44:40.790Z", "datePublished": "2026-05-20T13:35:29.018Z", "dateUpdated": "2026-05-27T15:41:02.357Z" }, "containers": { "cna": { "affected": [ { "collectionURL": "https://repo.hex.pm", "cpes": [ "cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "Elixir.PhoenixStorybook.Rendering.ComponentRenderer", "Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive", "Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers" ], "packageName": "phoenix_storybook", "packageURL": "pkg:hex/phoenix_storybook", "product": "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" ], "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" } ], "repo": "https://github.com/phenixdigital/phoenix_storybook", "vendor": "phenixdigital", "versions": [ { "lessThan": "1.1.0", "status": "affected", "version": "0.5.0", "versionType": "semver" } ] }, { "collectionURL": "https://github.com", "cpes": [ "cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "Elixir.PhoenixStorybook.Rendering.ComponentRenderer", "Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive", "Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers" ], "packageName": "phenixdigital/phoenix_storybook", "packageURL": "pkg:github/phenixdigital/phoenix_storybook", "product": "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" ], "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" } ], "repo": "https://github.com/phenixdigital/phoenix_storybook", "vendor": "phenixdigital", "versions": [ { "lessThan": "56ab8464d4375fa52db806148a06cce126ad481d", "status": "affected", "version": "e35379dfe2ef1a71b141899e36f431017c55265d", "versionType": "git" } ] } ], "cpeApplicability": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.1.0", "versionStartIncluding": "0.5.0", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "credits": [ { "lang": "en", "type": "finder", "value": "Nick Mykhailyshyn" }, { "lang": "en", "type": "analyst", "value": "Cenk Kücük" }, { "lang": "en", "type": "remediation developer", "value": "Christian Blavier" }, { "lang": "en", "type": "analyst", "value": "Jonatan Männchen / EEF" } ], "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

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.

" } ], "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=\"\" 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." } ], "impacts": [ { "capecId": "CAPEC-242", "descriptions": [ { "lang": "en", "value": "CAPEC-242 Code Injection" } ] } ], "metrics": [ { "cvssV4_0": { "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 9.5, "baseSeverity": "CRITICAL", "privilegesRequired": "NONE", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-94", "description": "CWE-94 Improper Control of Generation of Code ('Code Injection')", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-05-27T15:41:02.357Z" }, "references": [ { "tags": [ "vendor-advisory", "related" ], "url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-55hg-8qxv-qj4p" }, { "tags": [ "related" ], "url": "https://cna.erlef.org/cves/CVE-2026-8467.html" }, { "tags": [ "related" ], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-8467" }, { "tags": [ "patch" ], "url": "https://github.com/phenixdigital/phoenix_storybook/commit/56ab8464d4375fa52db806148a06cce126ad481d" } ], "source": { "discovery": "EXTERNAL" }, "title": "Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground", "x_generator": { "engine": "cvelib 1.8.0" } }, "adp": [ { "references": [ { "url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-55hg-8qxv-qj4p", "tags": [ "exploit" ] } ], "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-05-21T13:57:52.803277Z", "id": "CVE-2026-8467", "options": [ { "Exploitation": "poc" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-21T13:58:36.035Z" } } ] } }