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TI-2026-24412 Aliases CVE-2026-31860GHSA-g5xx-pwrp-g3fv

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

Priority MEDIUM 57CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00292 21st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed unhead (unjs): 2.1.11unhead (npm): 2.1.11

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
unjsunheadbefore 2.1.112.1.11Patch availableCNA
—unhead (npm)before 2.1.112.1.11Patch availableGHSA-g5xx-pwrp-g3fv
  • unhead Vendorunjs Affected before 2.1.11 Fixed in 2.1.11 Patch available CNA
  • unhead (npm) Vendor— Affected before 2.1.11 Fixed in 2.1.11 Patch available GHSA-g5xx-pwrp-g3fv

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:unjs:unhead:*:*:*:*:*:*:*:*before 2.1.11Vulnerableunjs
  • cpe:2.3:a:unjs:unhead:*:*:*:*:*:*:*:* Versions before 2.1.11 Vulnerable ·unjs

Remediation

  • Fix · CNA unhead (unjs) Fixed in 2.1.11
  • Fix · GHSA-g5xx-pwrp-g3fv unhead (npm) Fixed in 2.1.11 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-31860
  2. 2026-10-03 Alias added: GHSA-g5xx-pwrp-g3fv

References

Exploit 1

Advisory 1

Other 3

  • TI-2026-24425 Unhead has a Bypass of URI Scheme Sanitization in makeTagSafe via Case-Sensitivity CVSS 3.1MEDIUM 6.1
  • TI-2026-28305 Unhead has a hasDangerousProtocol() bypass via leading-zero padded HTML entities in useHeadSafe() CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences