{"id":"CVE-2026-100409","published":"2026-10-15T17:17:07.923","lastModified":"2026-10-16T20:04:29.760","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.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-177","CWE-180"],"vendors":[],"products":[],"references":[{"url":"https://github.com/opennextjs/opennextjs-aws/pull/1199","tags":[]},{"url":"https://github.com/opennextjs/opennextjs-aws/pull/1200","tags":[]},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b","tags":[]},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2","tags":[]},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6","tags":[]}],"exploitRefs":[{"url":"https://github.com/opennextjs/opennextjs-aws/pull/1199","tags":[]},{"url":"https://github.com/opennextjs/opennextjs-aws/pull/1200","tags":[]},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b","tags":[]},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2","tags":[]},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6","tags":[]}],"hasPoc":true,"ai":null}