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CVE-2026-100409— OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths

Quick assessment

Affected
opennextjs opennextjs-cloudflare
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.

OpenNext Cloudflare 是一个面向 Cloudflare 的开源 Next.js 适配器。在版本 0.3.0 至 1.20.2 之间，对于启用了 （缓存拦截）功能、依赖中间件进行访问控制，并且存在匹配缓存的保护路由的应用程序，其中间件匹配与缓存查找在处理编码路径名时存在不一致行为。 未经身份验证的攻击者可以利用一个经过百分号编码（percent-encoded）的路径名，该路径名虽无法与授权中间件匹配，但解码后可对应某个受保护路由的缓存键，从而导致无需授权即可返回缓存内容。此外，格式错误的编码也可能

CVSS 7.5 · High EPSS 0.30% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
opennextjs opennextjs-cloudflare >= 0.3.0, < 1.20.2 affected
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I. Basic Information for CVE-2026-100409

Vulnerability Information
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Vulnerability Title
OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths
Source: CVE Program / CVE List V5
Vulnerability Description
OpenNext Cloudflare is an open Next.js adapter for Cloudflare. From 0.3.0 until 1.20.2, applications that enable enableCacheInterception, rely on middleware for access control, and have a matching cached protected route process encoded pathnames inconsistently between middleware matching and cache lookup. An unauthenticated attacker can use a percent-encoded pathname that does not match authorization middleware but decodes to the cache key of a protected route, causing cached content to be returned without authorization. Malformed encodings can also be partially decoded, allowing cache lookup to continue with a pathname that middleware did not evaluate consistently. This issue is fixed in version 1.20.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
URL编码处理不恰当(Hex编码)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
opennextjs opennextjs-cloudflare >= 0.3.0, < 1.20.2 -

II. Public POCs for CVE-2026-100409

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III. Intelligence Information for CVE-2026-100409

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Patches & Fixes for CVE-2026-100409 (2)

Vendor Advisories for CVE-2026-100409 (1)

Other References for CVE-2026-100409 (1)

IV. Related Vulnerabilities

Same vendor: opennextjs
Same weakness: CWE-177

V. Comments for CVE-2026-100409

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