storybookjs storybook up to 7.6.22/8.6.16/9.1.18/10.2.9 WebSocket Message componentFilePath injection

Summaryinfo

A vulnerability marked as problematic has been reported in storybookjs storybook up to 7.6.22/8.6.16/9.1.18/10.2.9. Affected by this vulnerability is an unknown functionality of the component WebSocket Message Handler. The manipulation of the argument componentFilePath leads to injection. This vulnerability is uniquely identified as CVE-2026-27148. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in storybookjs storybook up to 7.6.22/8.6.16/9.1.18/10.2.9. This issue affects an unknown code of the component WebSocket Message Handler. The manipulation of the argument componentFilePath with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-27148 since 02/18/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 300113 (Linux Distros Unpatched Vulnerability : CVE-2026-27148), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 7.6.23, 8.6.17, 9.1.19 or 10.2.10 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 0affdf928bd6fafbadfb1dfe22ce6104805e10e8 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (300113). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• storybookjs

Name

• storybook

Version

• 7.6.0
• 7.6.1
• 7.6.2
• 7.6.3
• 7.6.4
• 7.6.5
• 7.6.6
• 7.6.7
• 7.6.8
• 7.6.9
• 7.6.10
• 7.6.11
• 7.6.12
• 7.6.13
• 7.6.14
• 7.6.15
• 7.6.16
• 7.6.17
• 7.6.18
• 7.6.19
• 7.6.20
• 7.6.21
• 7.6.22
• 8.6.0
• 8.6.1
• 8.6.2
• 8.6.3
• 8.6.4
• 8.6.5
• 8.6.6
• 8.6.7
• 8.6.8
• 8.6.9
• 8.6.10
• 8.6.11
• 8.6.12
• 8.6.13
• 8.6.14
• 8.6.15
• 8.6.16
• 9.1.0
• 9.1.1
• 9.1.2
• 9.1.3
• 9.1.4
• 9.1.5
• 9.1.6
• 9.1.7
• 9.1.8
• 9.1.9
• 9.1.10
• 9.1.11
• 9.1.12
• 9.1.13
• 9.1.14
• 9.1.15
• 9.1.16
• 9.1.17
• 9.1.18
• 10.2.0
• 10.2.1
• 10.2.2
• 10.2.3
• 10.2.4
• 10.2.5
• 10.2.6
• 10.2.7
• 10.2.8
• 10.2.9

License

• open-source

Website

• Product: https://github.com/storybookjs/storybook/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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