Improper Authorization in hono - CVE-2026-47673
Published: July 24, 2026
Vulnerability identifier: #VU139280
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-47673
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authorization controls.
The vulnerability exists due to improper authorization in jwt and jwk middleware when processing Authorization headers. A remote attacker can supply a valid JWT under a non-bearer authorization scheme identifier to bypass authorization controls.
This issue affects deployments that rely on scheme-aware external controls, such as WAFs, API gateways, or reverse proxies, to enforce policies based on the authorization scheme identifier.
Affected software
hono
How to mitigate CVE-2026-47673
Install security update from vendor's website.
hono - update to 4.12.21