Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/asymmetric-effort/specifyjs/commit/25d1fb491d99479efdf501f5f7
- https://github.com/asymmetric-effort/specifyjs/security/advisories/GHSA-93q6-wwj
FAQ
What is CVE-2026-50290?
CVE-2026-50290 is a documented vulnerability. 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 ...
How severe is CVE-2026-50290?
CVSS scoring is not yet available for CVE-2026-50290. Check NVD for updates.
Is there a patch for CVE-2026-50290?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.