PT-2026-145426

CVE-2026-126774

Published

2026-11-11

Updated

2026-11-11

Description by

CVSS 4.0

8.8

High

MetricsAV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

Name of the Vulnerable Software and Affected Versions @tinacms/mdx versions prior to 2.4.2

Description The MDX serializer fails to escape rich-text values when writing them into MDX expressions. This allows authenticated content editors to save specially crafted values that break out of list field or highlightColor expressions within the stored .mdx file. This can lead to the execution of arbitrary JavaScript in the browsers of visitors or on build and server-side rendering hosts.

Recommendations Update @tinacms/mdx to version 2.4.2 or later.

Exploitability

Exploit

Fix

Impacts

Researchers

Zachariah Mithani

Vendors

Affected products

Weakness enumeration

CWE-94: Improper Control of Generation of Code (\'Code Injection\')

Related identifiers