CVE-2026-27148 (GCVE-0-2026-27148)

Vulnerability from cvelistv5 – Published: 2026-02-25 21:46 – Updated: 2026-02-25 21:46
VLAI?
Title
Storybook Dev Server Vulnerable to WebSocket Hijacking
Summary
Storybook is a frontend workshop for building user interface components and pages in isolation. Prior to versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10, the WebSocket functionality in Storybook's dev server, used to create and update stories, is vulnerable to WebSocket hijacking. This vulnerability only affects the Storybook dev server; production builds are not impacted. Exploitation requires a developer to visit a malicious website while their local Storybook dev server is running. Because the WebSocket connection does not validate the origin of incoming connections, a malicious site can silently send WebSocket messages to the local instance without any further user interaction. If the Storybook dev server is intentionally exposed publicly (e.g. for design reviews or stakeholder demos) the risk is higher, as no malicious site visit is required. Any unauthenticated attacker can send WebSocket messages to it directly. The vulnerability affects the WebSocket message handlers for creating and saving stories. Both are vulnerable to injection via unsanitized input in the componentFilePath field, which can be exploited to achieve persistent XSS or Remote Code Execution (RCE). Versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10 contain a fix for the issue.
Severity ?
8.9 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CWE
  • CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version
storybookjs storybook Affected: < 7.6.23
Affected: >= 8.1.0, < 8.6.17
Affected: >= 9.0.0, < 9.1.19
Affected: >= 10.0.0, < 10.2.10
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "storybook",
          "vendor": "storybookjs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 7.6.23"
            },
            {
              "status": "affected",
              "version": "\u003e= 8.1.0, \u003c 8.6.17"
            },
            {
              "status": "affected",
              "version": "\u003e= 9.0.0, \u003c 9.1.19"
            },
            {
              "status": "affected",
              "version": "\u003e= 10.0.0, \u003c 10.2.10"
            }
          ]
        }
      ],
      "descriptions": [
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          "lang": "en",
          "value": "Storybook is a frontend workshop for building user interface components and pages in isolation. Prior to versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10, the WebSocket functionality in Storybook\u0027s dev server, used to create and update stories, is vulnerable to WebSocket hijacking. This vulnerability only affects the Storybook dev server; production builds are not impacted. Exploitation requires a developer to visit a malicious website while their local Storybook dev server is running. Because the WebSocket connection does not validate the origin of incoming connections, a malicious site can silently send WebSocket messages to the local instance without any further user interaction. If the Storybook dev server is intentionally exposed publicly (e.g. for design reviews or stakeholder demos) the risk is higher, as no malicious site visit is required. Any unauthenticated attacker can send WebSocket messages to it directly. The vulnerability affects the WebSocket message handlers for creating and saving stories. Both are vulnerable to injection via unsanitized input in the componentFilePath field, which can be exploited to achieve persistent XSS or Remote Code Execution (RCE). Versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10 contain a fix for the issue."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.9,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "ACTIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-74",
              "description": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component (\u0027Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-02-25T21:46:48.967Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
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          "tags": [
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          "url": "https://github.com/storybookjs/storybook/security/advisories/GHSA-mjf5-7g4m-gx5w"
        },
        {
          "name": "https://github.com/storybookjs/storybook/commit/0affdf928bd6fafbadfb1dfe22ce6104805e10e8",
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          "url": "https://github.com/storybookjs/storybook/commit/0affdf928bd6fafbadfb1dfe22ce6104805e10e8"
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        },
        {
          "name": "https://github.com/storybookjs/storybook/commit/b8cfa77c73940c140acdcd8a06ab1ea913c44761",
          "tags": [
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          "url": "https://github.com/storybookjs/storybook/commit/b8cfa77c73940c140acdcd8a06ab1ea913c44761"
        },
        {
          "name": "https://github.com/storybookjs/storybook/commit/d34085f39c647f5c23c3a3b2d197c18602fcf876",
          "tags": [
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          ],
          "url": "https://github.com/storybookjs/storybook/commit/d34085f39c647f5c23c3a3b2d197c18602fcf876"
        },
        {
          "name": "https://github.com/storybookjs/storybook/releases/tag/v10.2.10",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/storybookjs/storybook/releases/tag/v10.2.10"
        },
        {
          "name": "https://github.com/storybookjs/storybook/releases/tag/v7.6.23",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/storybookjs/storybook/releases/tag/v7.6.23"
        },
        {
          "name": "https://github.com/storybookjs/storybook/releases/tag/v8.6.17",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/storybookjs/storybook/releases/tag/v8.6.17"
        },
        {
          "name": "https://github.com/storybookjs/storybook/releases/tag/v9.1.19",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/storybookjs/storybook/releases/tag/v9.1.19"
        }
      ],
      "source": {
        "advisory": "GHSA-mjf5-7g4m-gx5w",
        "discovery": "UNKNOWN"
      },
      "title": "Storybook Dev Server Vulnerable to WebSocket Hijacking"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-27148",
    "datePublished": "2026-02-25T21:46:48.967Z",
    "dateReserved": "2026-02-18T00:18:53.961Z",
    "dateUpdated": "2026-02-25T21:46:48.967Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}


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Sightings

Author Source Type Date

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.



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