CVE-2026-54290: Honojs Hono

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, with credentials: true and no explicit origin (the default wildcard), the CORS Middleware reflects the request's Origin and sends Access-Control-Allow-Credentials: true. Any site can then make credentialed cross-origin requests and read the responses, exposing cookie-authenticated endpoints to arbitrary origins. This vulnerability is fixed in 4.12.25.

Affected products

• Honojs Hono: before 4.12.25 (fixed in 4.12.25)

Published 2026-06-22. Last modified 2026-06-22.