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CVE-2026-47673— Hono: JWT middleware accepts any Authorization scheme, not only Bearer

Quick assessment

Affected
honojs hono
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hono是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.21之前版本存在授权问题漏洞，该漏洞源于jwt和jwk中间件未验证Authorization标头值使用Bearer方案，可能导致任何两部分的标头值进行JWT验证，从而使用非Bearer方案标识符的请求被错误认证。

CVSS 4.8 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.21 affected
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I. Basic Information for CVE-2026-47673

Vulnerability Information
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Vulnerability Title
Hono: JWT middleware accepts any Authorization scheme, not only Bearer
Source: CVE Program / CVE List V5
Vulnerability Description
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 — regardless of the scheme name in the first position — proceeds to JWT verification. A request presenting a valid JWT under a non-Bearer scheme identifier (such as Basic or Token) is authenticated identically to a correctly formed Bearer request. This vulnerability is fixed in 4.12.21.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.21之前版本存在授权问题漏洞，该漏洞源于jwt和jwk中间件未验证Authorization标头值使用Bearer方案，可能导致任何两部分的标头值进行JWT验证，从而使用非Bearer方案标识符的请求被错误认证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs hono < 4.12.21 -

II. Public POCs for CVE-2026-47673

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III. Intelligence Information for CVE-2026-47673

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Vendor Advisories for CVE-2026-47673 (1)

Same Patch Batch · honojs · 2026-05-28 · 4 CVEs total

CVE-2026-47674 5.3 MEDIUM Hono: IP Restriction bypasses static deny rules for non-canonical IPv6
CVE-2026-47676 5.3 MEDIUM Hono: app.mount() strips mount prefix using undecoded path, causing incorrect routing for
CVE-2026-47675 4.3 MEDIUM Hono: Cookie helper does not sanitize sameSite and priority, allowing Set-Cookie injection

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-285

V. Comments for CVE-2026-47673

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