--- title: "OpenNext Cloudflare - Authorization Bypass" description: "OpenNext Cloudflare 0.3.0 to 1.20.2 contains an authorization bypass caused by inconsistent processing of encoded pathnames between middleware and cache lookup, letting unauthenticated attackers access cached protected content, exploit requires enabled cache interception and matching cached protected routes." url: https://panop.io/threat-heartbeat/CVE-2026-100409/ --- # CVE-2026-100409 OpenNext Cloudflare - Authorization Bypass OpenNext Cloudflare 0.3.0 to 1.20.2 contains an authorization bypass caused by inconsistent processing of encoded pathnames between middleware and cache lookup, letting unauthenticated attackers access cached protected content, exploit requires enabled cache interception and matching cached protected routes. CVSS base score 7.5 /10 High CISA KEV Not listed Public exploit None known Authentication Not required [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-100409) ## Details Type Broken Access Control Impact Information Disclosure CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Published 15 October 2026 Updated 16 October 2026 Weakness [CWE-177](https://cwe.mitre.org/data/definitions/177.html) ## Vendor fix Update to version 1.20.2 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-100409](https://nvd.nist.gov/vuln/detail/CVE-2026-100409) - [https://github.com/opennextjs/opennextjs-aws/pull/1199](https://github.com/opennextjs/opennextjs-aws/pull/1199) - [https://github.com/opennextjs/opennextjs-aws/pull/1200](https://github.com/opennextjs/opennextjs-aws/pull/1200) - [https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b](https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b) - [https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2](https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2) - [https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6](https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)