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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-31860

Unhead has a XSS bypass in `useHeadSafe` via attribute name injection and case-sensitive protocol check

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

Unhead is a document head and template manager. Prior to 2.1.11, useHeadSafe() can be bypassed to inject arbitrary HTML attributes, including event handlers, into SSR-rendered <head> tags. This is the composable that Nuxt docs recommend for safely handling user-generated content. The acceptDataAttrs function (safe.ts, line 16-20) allows any property key starting with data- through to the final HTML. It only checks the prefix, not whether the key contains spaces or other characters that break HTML attribute parsing. This vulnerability is fixed in 2.1.11.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

unjs unhead

  • < 2.1.11affected

References