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.
Published: 2026-03-12
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Cross‑Site Scripting via attribute injection in SSR
Action: Immediate Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-g5xx-pwrp-g3fv Unhead has XSS bypass in `useHeadSafe` via attribute name injection and case-sensitive protocol check
History

Mon, 16 Mar 2026 18:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:unjs:unhead:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

Fri, 13 Mar 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 13 Mar 2026 10:00:00 +0000

Type Values Removed Values Added
First Time appeared Unjs
Unjs unhead
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
Metrics cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}

Subscriptions

Unjs Unhead
cve-icon 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

cve-icon Vulnrichment

Updated: 2026-03-13T16:26:40.074Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-12T18:16:24.227

Modified: 2026-03-16T17:56:34.140

Link: CVE-2026-31860

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-20T15:48:50Z

Weaknesses