CVE-2026-126774

@tinacms/mdx before 2.4.2 Code Injection via MDX Serializer Rich-Text Values

Published Nov 11, 2026 CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Description
@tinacms/mdx before 2.4.2 contains a code injection vulnerability in its MDX serializer, which writes rich-text values into MDX expressions without escaping them. Authenticated content editors can save crafted values that break out of list field or highlightColor expressions in the stored .mdx file, executing JavaScript in visitors' browsers or on build and server-side rendering hosts.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

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History
Type Values Removed Values Added
Description @tinacms/mdx before 2.4.2 contains a code injection vulnerability in its MDX serializer, which writes rich-text values into MDX expressions without escaping them. Authenticated content editors can save crafted values that break out of list field or highlightColor expressions in the stored .mdx file, executing JavaScript in visitors' browsers or on build and server-side rendering hosts.
Title @tinacms/mdx before 2.4.2 Code Injection via MDX Serializer Rich-Text Values
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N'}

cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N'}

Subscriptions

No data.

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 11, 2026, 6:41 PM
Reserved
Nov 11, 2026, 6:27 PM
Status
Awaiting Analysis
Published
Nov 11, 2026, 7:17 PM
Modified
Nov 12, 2026, 8:28 PM