PT-2026-42227 · Telejson · Telejson

Niccolò Parlanti · Published 2026-04-02 · Updated 2026-05-20 · CVE-2026-47099

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions TeleJSON versions prior to 6.0.0

Description An issue exists in the parse() function involving unsafe deserialization. When reconstructing object prototypes, a custom reviver passes the value of the constructor-name property directly to new Function() without sanitization. This allows an attacker to execute arbitrary JavaScript by delivering a crafted JSON payload, for example, through postMessage in cross-frame communication contexts.

Recommendations Update to version 6.0.0 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-47099

GHSA-CCGF-5RWJ-J3HV

Affected Products

Telejson

References · 6

• 🔥 https://github.com/Niccolo10/Security-Advisories/blob/main/CVE-2026-47099/cve-2026-47099.md · Exploit
• https://osv.dev/vulnerability/GHSA-ccgf-5rwj-j3hv · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-47099 · Security Note
• https://github.com/storybookjs/telejson · Note
• https://github.com/storybookjs/telejson/security/advisories/GHSA-ccgf-5rwj-j3hv · Patch, Vendor Advisory
• https://vulncheck.com/advisories/telejson-dom-based-xss-via-parse-function · Note