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.
PUBLISHED5.2CWE-942
Hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the wildcard
Problem type
Affected products
honojs
hono
< 4.12.25 - AFFECTED
References
GitHub Security Advisories
GHSA-88fw-hqm2-52qc
hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the wildcard
https://github.com/advisories/GHSA-88fw-hqm2-52qcSummary
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.
Details
The spec forbids Access-Control-Allow-Origin: * with credentials and browsers reject it, so this configuration used to fail closed. In affected versions the middleware reflects the request Origin instead, so it now succeeds for every origin, including null. The preflight also echoes the requested headers back, approving non-simple credentialed requests too.
This issue arises when an application enables credentials: true and leaves origin unset or set to the wildcard.
Impact
Any third-party page a logged-in user visits can read the application's cookie-authenticated endpoints and perform credentialed state-changing requests. This affects applications that enable credentialed CORS without restricting origin.
JSON source
https://cveawg.mitre.org/api/cve/CVE-2026-54290Click to expand
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