CVE-2026-59895

mediumCVSS 6.1covered by 1 sourcefirst seen 2026-07-08

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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Exploitation outlook

Low exploitation risk0.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-59895: Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0…nvd · 2026-07-08

External references

NVD record for CVE-2026-59895

CVE.org record

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