CVE-2026-31860

MEDIUM

6.1

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.

CVE Details

CVSS v3.1 Score6.1

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published3/12/2026

Last Modified3/16/2026

Sourcenvd

Honeypot Sightings0

Affected Products

unjs:unhead

Weaknesses (CWE)

CWE-79

References

https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv(security-advisories@github.com)

https://github.com/unjs/unhead/security/advisories/GHSA-g5xx-pwrp-g3fv(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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