Medium severity6.1NVD Advisory· Published Mar 12, 2026· Updated Jun 17, 2026
CVE-2026-31860
CVE-2026-31860
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 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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
unheadnpm | < 2.1.11 | 2.1.11 |
Affected products
3Patches
Vulnerability mechanics
References
5- github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fvnvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-g5xx-pwrp-g3fvghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-31860ghsaADVISORY
- github.com/unjs/unhead/commit/9ecc4f9568b0e23938f36d4b23fcfa4a18a89045ghsaWEB
- github.com/unjs/unhead/releases/tag/v2.1.11ghsaWEB
News mentions
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