What is CVE-2026-47673?

CVE-2026-47673 is a medium-severity vulnerability in Hono, classified under Improper Authorization. CVSS score: 4.8/10. Published 2026-05-28.

How severe is CVE-2026-47673?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Auth bypass in Hono

CVE-2026-47673

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the jwt and jwk middlewares do not verify that the Authorization header value uses theBearer scheme. Any two-part header value — regard…

EPSS: 0.000 (11.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Hono
Honojs Hono — versions < 4.12.21

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-47673?: CVE-2026-47673 is a medium-severity vulnerability in Hono, classified under Improper Authorization. CVSS score: 4.8/10. Published 2026-05-28.
How severe is CVE-2026-47673?: Medium severity. CVSS v3 base score is 4.8 out of 10.