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    CVE-2026-31860

    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:Mar 12, 2026
    Last Modified:Mar 20, 2026
    EPS:Mar 12, 2026
    EPSS Score:0.00036
    CVSS Score:6.1

    Affected Products

    Vendor
    Unjs
    Product
    Unhead

    Exploits

    https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fvhttps://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High