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CVE-2026-31873 - Vulnerability Analysis

None

Last Updated: March 16, 2026

Unhead - Stored XSS

Published: March 12, 2026Updated: March 16, 2026PoC AvailableRemote Exploitable

Overview

Unhead < 2.1.11 contains a stored XSS caused by case-sensitive link.href check in makeTagSafe, letting attackers inject arbitrary CSS for UI redressing or data exfiltration, exploit requires crafted input.

Severity & Score

Severity: None

Impact

Attackers can inject arbitrary CSS, enabling UI redressing or data exfiltration via CSS callbacks.

Mitigation

Update to version 2.1.11 or later.

References

https://github.com/unjs/unhead/security/advisories/GHSA-5339-hvwr-7582

Related Resources

Vulnerability Intelligence Dashboard
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Details

CVE ID: CVE-2026-31873
Severity: None
Type: stored_xss
Status: confirmed

CWE

CWE-79

CVSS Metrics

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