CVE-2026-31873
CVE-2026-31873 · Unhead has a Bypass of URI Scheme Sanitization in makeTagSafe via Case-Sensitivity
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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 0.0 · Niedrig · EPSS 0,2% · Korrektur verfügbar
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Technologie-Stack: node