storybookjs telejson up to 5.x JSON parse cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in storybookjs telejson up to 5.x. Affected by this vulnerability is the function parse of the component JSON Handler. Performing a manipulation results in cross site scripting. This vulnerability is reported as CVE-2026-47099. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in storybookjs telejson up to 5.x. It has been classified as problematic. This affects the function parse of the component JSON Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

TeleJSON prior to 6.0.0 contains a DOM-based cross-site scripting vulnerability in the parse() function that allows attackers to execute arbitrary JavaScript by delivering a crafted JSON payload containing a malicious _constructor-name_ property value. The custom reviver passes the constructor name directly to new Function() without sanitization when recreating object prototypes, enabling attackers to inject arbitrary JavaScript through vectors such as postMessage in cross-frame communication contexts to achieve script execution within the application.

The weakness was disclosed by Niccolò Parlanti. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-47099 since 05/18/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 6.0.0 eliminates this vulnerability.

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Productinfo

Vendor

• storybookjs

Name

• telejson

Version

• 5.x

Website

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

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