Cross-site scripting in hono - CVE-2026-56761
Published: July 24, 2026
Vulnerability identifier: #VU139305
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-56761
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to inject unintended HTML into server-side rendered output.
The vulnerability exists due to cross-site scripting in hono/jsx server-side rendering when using untrusted input as JSX attribute keys. A remote attacker can supply specially crafted attribute names to inject unintended HTML into server-side rendered output.
User interaction is required to load the rendered content, and potential cross-site scripting may occur if the injected output is used in unsafe patterns.
Affected software
hono
How to mitigate CVE-2026-56761
Install security update from vendor's website.
hono - update to 4.12.14