1. Home
  2. CVE Database
  3. CVE-2026-31873
NONE · 0.0

CVE-2026-31873

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-insensiti...

Vulnerability 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.

CVSS Score

0.0

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
NONE

Affected Products

VendorProductVersions
UnjsUnhead< 2.1.11

Related Weaknesses (CWE)

CWE-79

References

FAQ

What is CVE-2026-31873?

CVE-2026-31873 is a vulnerability with a CVSS score of 0.0 (NONE). 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-insensiti...

How severe is CVE-2026-31873?

CVE-2026-31873 has been rated NONE with a CVSS base score of 0.0/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-31873?

Check the references section above for vendor advisories and patch information. Affected products include: Unjs Unhead.