{"id":"CVE-2026-100409","sourceIdentifier":"security-advisories@github.com","published":"2026-10-15T17:17:07.923","lastModified":"2026-10-16T20:04:29.760","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"opennextjs","product":"opennextjs-cloudflare","versions":[{"version":">= 0.3.0, < 1.20.2","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-15T17:50:22.601978Z","id":"CVE-2026-100409","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-177"},{"lang":"en","value":"CWE-180"}]}],"references":[{"url":"https://github.com/opennextjs/opennextjs-aws/pull/1199","source":"security-advisories@github.com"},{"url":"https://github.com/opennextjs/opennextjs-aws/pull/1200","source":"security-advisories@github.com"},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b","source":"security-advisories@github.com"},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2","source":"security-advisories@github.com"},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6","source":"security-advisories@github.com"}]}