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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00054.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
unjs unhead affected
Version Status Constraints
< 2.1.11 affected —

No data.

No data.

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Vendors Products
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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
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv cve-icon cve-icon cve-icon
History

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'}

Projects

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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 : Awaiting Analysis

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

Modified: 2026-03-13T19:54:36.657

Link: CVE-2026-31860

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-13T09:50:53Z

Weaknesses