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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v3.1
References 5
https://github.com/opennextjs/opennextjs-aws/pull/1199
security-advisories@github.com
https://github.com/opennextjs/opennextjs-aws/pull/1200
security-advisories@github.com
https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09…
security-advisories@github.com
https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cl…
security-advisories@github.com
https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2v…
security-advisories@github.com