High severity · published Jun 22, 2026
CVE-2026-54290
Hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the wildcard
7.1
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HO
hono · honojs
< 4.12.25 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54290
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-54290
github.com
https://github.com/honojs/hono/security/advisories/GHSA-88fw-hqm2-52qc
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