AIKIDO-2026-10775
hono is vulnerable to CSS Injection
43
Medium Risk
This Affects:
honoTL;DR
Server-side JSX style-object serialization escapes for HTML attribute context but not for CSS declaration context. Untrusted style values or property names can inject additional CSS declarations into the rendered style attribute. This enables UI manipulation and style-driven exfiltration patterns without direct JavaScript execution. The fix adds stricter CSS-context handling so injected declaration boundaries are not interpreted as attacker-controlled CSS.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
hono is vulnerable to CSS Injection in versions 0.0.1 - 4.12.16.
How to fix this
Upgrade the hono library to the patch version.
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SOC 2Compliant
ISO 27001Compliant