Improper handling of JSX attribute names in hono/jsx allows malformed attribute keys to corrupt the generated HTML output.
When untrusted input is used as attribute keys during server-side rendering, specially crafted keys can break out of attribute or tag boundaries and inject unintended HTML.
When rendering JSX elements to HTML strings, attribute values are escaped, but attribute names (keys) were previously inserted into the output without validation.
If an attribute name contains characters such as ", >, or whitespace, it can alter the structure of the generated HTML.
For example, malformed attribute names can:
This issue arises when untrusted input (such as query parameters or form data) is used as JSX attribute keys during server-side rendering.
An attacker who can control attribute keys used in JSX rendering may inject unintended attributes or HTML elements into the generated output.
This may lead to:
This issue affects applications that pass untrusted input as JSX attribute keys during server-side rendering.
| Software | From | Fixed in |
|---|---|---|
hono
|
- | 4.12.14 |
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
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Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
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