{"action":"Upgrade storybook to 8.6.17 or later.","affected":[{"fixed":"8.6.17","introduced":"8.1.0"},{"fixed":"9.1.19","introduced":"8.7.0-alpha.0"},{"fixed":"10.2.10","introduced":"10.0.0-beta.0"}],"component":"storybook","cve_ids":["CVE-2026-27148"],"ecosystem":"npm","epss":0.00632,"exploited":false,"fixed_versions":["8.6.17","9.1.19","10.2.10"],"ghsa_id":"GHSA-mjf5-7g4m-gx5w","id":"tcs_01M5KG0Y91ETQCT9V85XY2A0Y9","modified_at":"2026-02-26T15:32:56.650508Z","published_at":"2026-02-26T15:16:10Z","references":["https://osv.dev/vulnerability/GHSA-mjf5-7g4m-gx5w","https://github.com/storybookjs/storybook/security/advisories/GHSA-mjf5-7g4m-gx5w","https://nvd.nist.gov/vuln/detail/CVE-2026-27148","https://github.com/storybookjs/storybook/commit/0affdf928bd6fafbadfb1dfe22ce6104805e10e8","https://github.com/storybookjs/storybook/commit/54689a8add18ea75d628c540f4bc677592a1e685","https://github.com/storybookjs/storybook/commit/b8cfa77c73940c140acdcd8a06ab1ea913c44761","https://github.com/storybookjs/storybook/commit/d34085f39c647f5c23c3a3b2d197c18602fcf876","https://github.com/storybookjs/storybook","https://github.com/storybookjs/storybook/releases/tag/v10.2.10","https://github.com/storybookjs/storybook/releases/tag/v7.6.23","https://github.com/storybookjs/storybook/releases/tag/v8.6.17","https://github.com/storybookjs/storybook/releases/tag/v9.1.19"],"severity":{"label":"critical","score":9.6},"sources":[{"source":"osv","source_id":"GHSA-mjf5-7g4m-gx5w","url":"https://osv.dev/vulnerability/GHSA-mjf5-7g4m-gx5w"},{"source":"nvd","source_id":"CVE-2026-27148","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27148"}],"summary":"Storybook Dev Server is Vulnerable to WebSocket Hijacking"}