MSRXCVE-2026-100409
CVE-2026-100409
OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths
CVSS 3.1 · CNA
chance of exploitation in the next 30 days (EPSS; higher than 23% of CVEs)
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.
Scores
Affected packages and fixed versions
| Package | Ecosystem | Fixed in |
|---|---|---|
| @opennextjs/cloudflare | npm | 1.20.2 |
Affected products
- opennextjs opennextjs-cloudflare: >= 0.3.0, < 1.20.2
Also known as: GHSA-2vc4-c4r6-p6v6
5 references (advisories, patches, write-ups)
- https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6 · x_refsource_CONFIRM
- https://github.com/opennextjs/opennextjs-aws/pull/1199 · x_refsource_MISC
- https://github.com/opennextjs/opennextjs-aws/pull/1200 · x_refsource_MISC
- https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b · x_refsource_MISC
- https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2 · x_refsource_MISC
Sources: CVE.org, OSV.dev, FIRST EPSS. Missing ones did not answer or have no record yet.