Bug 2442784 (CVE-2026-27148)

Summary: CVE-2026-27148 storybook: Storybook: Remote Code Execution via WebSocket Hijacking
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: chfoley, jscholz, lchilton, sfeifer, swoodman
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Storybook's development server. This vulnerability allows a remote attacker to achieve Remote Code Execution or persistent Cross-Site Scripting by exploiting WebSocket hijacking. The attack can occur if a developer visits a malicious website while their local Storybook development server is active, or directly by an unauthenticated attacker if the server is publicly accessible. This is due to insufficient validation of WebSocket connection origins and unsanitized input, leading to significant security risks.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2442869, 2442870    
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Description OSIDB Bzimport 2026-02-25 22:02:20 UTC 
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.