Security Advisory

CVE-2026-50290

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-21 19:55:51

Last updated 2026-08-21 20:07:10

Assigner GitHub_M

CVSS score 5.3

State PUBLISHED

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.

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