CVE-2026-47099

Medium

Description

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.

SeverityMedium

CVSS6.1

Exploit probability—

ProductTelejson

PublishedMay 20, 2026

First seenMay 20, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

telejson6.0.0 or later

Vendor advisories

github.com/storybookjs/telejson/security/advisories/GHSA-ccgf-5rwj-j3hv

Affected products

Product	Affected versions	Fixed in
telejsonnpm	v < 6.0.0	6.0.0

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