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CVE-2026-59895

6.1 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 6.1 · honoNVD modified 2026-10-25 17:10

Affected (CPE criteria) 1

  • cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*

References 3