CVE-2026-50290 - @asymmetric-effort/specifyjs: CSS expression sanitization is bypassable in renderToString

CVE-2026-50290 - @asymmetric-effort/specifyjs: CSS expression sanitization is bypassable in renderToString

https://cvefeed.io/rssfeed/latest.atom / Fri, 08/21/2026 - 22:27
CVE ID :CVE-2026-50290
Published : Aug. 21, 2026, 7:55 p.m. | 6 minutes ago
Description :SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped `expression(` and `url(javascript:` using simple regex, but could be bypassed with CSS unicode escapes (`\65xpression(`), null bytes, or CSS comments (`exp/**/ression(`). These CSS injection vectors only work in legacy browsers (IE6-IE10). SpecifyJS targets modern browsers. Starting in version 0.2.136, CSS sanitization now normalizes unicode escapes and strips CSS comments before pattern matching. Also checks for `behavior:`, `-moz-binding`, and `-o-link` patterns.
Severity: 0.0 | NA
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