CVE-2026-59895 — Hono: Server-Side XSS via JSX Escaping Bypass in cx() Utility
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0.0 before 4.12.27, cx() in hono/css composes class names from plain strings but mar…
Published: 2026-07-08 · CVSS: 6.1 · CVSS 3.1
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0.0 before 4.12.27, cx() in hono/css composes class names from plain strings but marks the result as already escaped without HTML-escaping the input, allowing untrusted className values used in a JSX class attribute during server-side rendering to break out of the attribute and inject arbitrary markup. This issue is fixed in version 4.12.27.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7