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.
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History
Wed, 08 Jul 2026 20:30:00 +0000
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ssvc
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Wed, 08 Jul 2026 16:30:00 +0000
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| Description | 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. | |
| Title | Hono: Server-Side XSS via JSX Escaping Bypass in cx() Utility | |
| Weaknesses | CWE-116 CWE-79 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-08T19:41:04.292Z
Reserved: 2026-07-07T16:40:07.983Z
Link: CVE-2026-59895
Updated: 2026-07-08T17:50:21.185Z
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