CVE-2026-54290
Hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the wildcard
Description
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.
INFO
Published Date :
June 22, 2026, 5:15 p.m.
Last Modified :
June 22, 2026, 5:15 p.m.
Remotely Exploit :
Yes !
Source :
GitHub_M
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update Hono to version 4.12.25 or later.
- Configure CORS middleware with explicit origins.
- Set Access-Control-Allow-Credentials appropriately.
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