Bug 2571858 (CVE-2026-126774) - CVE-2026-126774 @tinacms/mdx: @tinacms/mdx: Arbitrary code execution via unescaped rich-text expressions
Summary: CVE-2026-126774 @tinacms/mdx: @tinacms/mdx: Arbitrary code execution via unes...
Keywords:
Status: NEW
Alias: CVE-2026-126774
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-11 18:51 UTC by OSIDB Bzimport
Modified: 2026-11-11 18:59 UTC (History)
0 users

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Description OSIDB Bzimport 2026-11-11 18:51:12 UTC 
@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.
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