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CVE-2026-54290— Hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the wildcard

Quick assessment

Affected
honojs hono
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

honojs hono是honojs的Web服务器。 honojs hono 4.12.25之前版本存在配置错误漏洞，该漏洞源于CORS中间件配置问题，未明确指定origin（使用默认通配符）时设置credentials: true，导致任意站可发出凭据跨域请求并读取响应，暴露cookie认证端点。

CVSS 7.1 · High EPSS 0.33% · P26

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.25 affected
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I. Basic Information for CVE-2026-54290

Vulnerability Information
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Vulnerability Title
Hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the wildcard
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过度许可的跨域白名单
Source: CVE Program / CVE List V5
Vulnerability Title
honojs hono 配置错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
honojs hono是honojs的Web服务器。 honojs hono 4.12.25之前版本存在配置错误漏洞，该漏洞源于CORS中间件配置问题，未明确指定origin（使用默认通配符）时设置credentials: true，导致任意站可发出凭据跨域请求并读取响应，暴露cookie认证端点。
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 < 4.12.25 -

II. Public POCs for CVE-2026-54290

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7018 chars
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III. Intelligence Information for CVE-2026-54290

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Vendor Advisories for CVE-2026-54290 (1)

Same Patch Batch · honojs · 2026-06-22 · 5 CVEs total

CVE-2026-54288 6.5 MEDIUM Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`
CVE-2026-54286 5.9 MEDIUM Hono: Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)
CVE-2026-54287 5.3 MEDIUM Hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping coo
CVE-2026-54289 4.8 MEDIUM Hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-942

V. Comments for CVE-2026-54290

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