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.
Metrics
Affected Vendors & Products
| Vendors | Products |
|---|---|
| Unjs |
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References
History
Fri, 13 Mar 2026 10:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Unjs
Unjs unhead |
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| Vendors & Products |
Unjs
Unjs unhead |
Thu, 12 Mar 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Unhead has a XSS bypass in `useHeadSafe` via attribute name injection and case-sensitive protocol check | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-03-13T16:26:51.670Z
Reserved: 2026-03-09T19:02:25.012Z
Link: CVE-2026-31860
Vulnrichment
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NVD
Status : Awaiting Analysis
Published: 2026-03-12T18:16:24.227
Modified: 2026-03-12T21:07:53.427
Link: CVE-2026-31860
Redhat
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