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ETK-2026-1456Zero's internal tracking ID, independent of the CVE number.

ETK-2026-1456Zero's internal tracking ID, independent of the CVE number.

validatedZero produced an exploit or a check.

GHSA-f2ph-cmg5-wxc8 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
awaiting cvepublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
npm:storybook >= 8.0.0, < 8.6.19; >= 9.0.0, < 9.1.21; >= 10.0.0, < 10.6.2; >= 11.0.0-alpha.0, < 11.0.0-alpha.6; >= 10.6.0, < 10.6.2
fixed in 8.6.19, 9.1.21, 10.6.2, 11.0.0-alpha.6
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
ETK-2026-1456Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:npm/storybook
pkg:npm/@storybook/core
pkg:npm/@storybook/core-server
pkg:npm/@storybook/experimental-addon-test
pkg:npm/@storybook/addon-vitest
pkg:npm/@storybook/addon-mcp
cvss9.4cna vendorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
−7.7dTTV
21mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = cve.org, not yet published
trigger signal −8.4dcheck available−7.7dagent stopped
−6d
−4d
−2d
0

description

Affected Storybook development servers can be influenced by an attacker-controlled website to alter files in a developer project. The risk requires a running vulnerable dev server and user interaction; code execution may follow if a modified file is later run by a local process. Built Storybook deployments are not affected.

mitigation

Upgrade Storybook to 8.6.19, 9.1.21, 10.6.2, or 11.0.0-alpha.6, as appropriate for your release line, before running the dev server. Until upgraded, do not run affected development servers, especially where they are reachable from unrestricted web browsing.

fixed in 8.6.19, 9.1.21, 10.6.2, 11.0.0-alpha.6

check
available
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
deterministic
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
21m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
not published yet
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Check only, differential: the check fires on the vulnerable build and is silent on the patched one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-10-12 19:13Z

this entry in the feed

GET /api/v1/feed/ETK-2026-1456

{
  "etk_id": "ETK-2026-1456",
  "cve_id": null,
  "display_id": "ETK-2026-1456",
  "ghsa_id": "GHSA-f2ph-cmg5-wxc8",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Cross-origin file modification in Storybook development server",
  "summary": "Affected Storybook development servers can be influenced by an attacker-controlled website to alter files in a developer project. The risk requires a running vulnerable dev server and user interaction; code execution may follow if a modified file is later run by a local process. Built Storybook deployments are not affected.",
  "mitigation": "Upgrade Storybook to 8.6.19, 9.1.21, 10.6.2, or 11.0.0-alpha.6, as appropriate for your release line, before running the dev server. Until upgraded, do not run affected development servers, especially where they are reachable from unrestricted web browsing.",
  "vendor": "npm",
  "product": "npm:storybook",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 8.0.0, < 8.6.19"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "8.6.19"
      ],
      "package_name": "storybook",
      "purl": "pkg:npm/storybook"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 9.0.0, < 9.1.21"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "9.1.21"
      ],
      "package_name": "storybook",
      "purl": "pkg:npm/storybook"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 10.0.0, < 10.6.2"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "10.6.2"
      ],
      "package_name": "storybook",
      "purl": "pkg:npm/storybook"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-alpha.0, < 11.0.0-alpha.6"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "11.0.0-alpha.6"
      ],
      "package_name": "storybook",
      "purl": "pkg:npm/storybook"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 8.0.0, < 8.6.19"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "8.6.19"
      ],
      "package_name": "@storybook/core",
      "purl": "pkg:npm/@storybook/core"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 8.0.0, < 8.6.19"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "8.6.19"
      ],
      "package_name": "@storybook/core-server",
      "purl": "pkg:npm/@storybook/core-server"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 8.0.0, < 8.6.19"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "8.6.19"
      ],
      "package_name": "@storybook/experimental-addon-test",
      "purl": "pkg:npm/@storybook/experimental-addon-test"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 9.0.0, < 9.1.21"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "9.1.21"
      ],
      "package_name": "@storybook/addon-vitest",
      "purl": "pkg:npm/@storybook/addon-vitest"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 10.0.0, < 10.6.2"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "10.6.2"
      ],
      "package_name": "@storybook/addon-vitest",
      "purl": "pkg:npm/@storybook/addon-vitest"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-alpha.0, < 11.0.0-alpha.6"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "11.0.0-alpha.6"
      ],
      "package_name": "@storybook/addon-vitest",
      "purl": "pkg:npm/@storybook/addon-vitest"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 10.6.0, < 10.6.2"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "10.6.2"
      ],
      "package_name": "@storybook/addon-mcp",
      "purl": "pkg:npm/@storybook/addon-mcp"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-alpha.0, < 11.0.0-alpha.6"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "11.0.0-alpha.6"
      ],
      "package_name": "@storybook/addon-mcp",
      "purl": "pkg:npm/@storybook/addon-mcp"
    }
  ],
  "cwes": [
    22
  ],
  "cvss_score": 9.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 20.733275683333332,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-13T11:14:30.966596+00:00",
      "days": -7.733998612407407,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T04:51:28.475359+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-12T19:13:09+00:00",
      "days": -8.401613966527778,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T04:51:28.475359+00:00",
      "url": "https://github.com/storybookjs/storybook/security/advisories/GHSA-f2ph-cmg5-wxc8"
    }
  }
}

published 2026-10-13 10:53Z
last change 2026-10-21 04:45Z

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