CVE-2026-31873

NONE

0.0

Description

Unhead is a document head and template manager. Prior to 2.1.11, The link.href check in makeTagSafe (safe.ts) uses String.includes(), which is case-sensitive. Browsers treat URI schemes case-insensitively. DATA:text/css,... is the same as data:text/css,... to the browser, but 'DATA:...'.includes('data:') returns false. An attacker can inject arbitrary CSS for UI redressing or data exfiltration via CSS attribute selectors with background-image callbacks. This vulnerability is fixed in 2.1.11.

CVE Details

CVSS v3.1 Score0.0

SeverityNONE

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

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-5339-hvwr-7582(security-advisories@github.com)

IOC Correlations

No correlations recorded

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