SB2026040224 - Improper Neutralization of Special Elements in Output Used by a Downstream Component in Storybook
Published: April 2, 2026
Security Bulletin ID
SB2026040224
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Neutralization of Special Elements in Output Used by a Downstream Component (CVE-ID: CVE-2026-27148)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to the WebSocket functionality in Storybook's dev server, used to create and update stories, is vulnerable to WebSocket hijacking. A remote unauthenticated attacker can trick the victim into visiting a malicious website while their local Storybook dev server is running.
Remediation
Install update from vendor's website.
References
- 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/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
- https://github.com/storybookjs/storybook/security/advisories/GHSA-mjf5-7g4m-gx5w