CVE-2026-33538: Parse Server: Denial of Service via unindexed database query for unconfigured auth providers
(updated )
An unauthenticated attacker can cause Denial of Service by sending authentication requests with arbitrary, unconfigured provider names. The server executes a database query for each unconfigured provider before rejecting the request, and since no database index exists for unconfigured providers, each request triggers a full collection scan on the user database. This can be parallelized to saturate database resources.
References
- github.com/advisories/GHSA-g4cf-xj29-wqqr
- github.com/parse-community/parse-server
- github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357
- github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54
- github.com/parse-community/parse-server/pull/10270
- github.com/parse-community/parse-server/pull/10271
- github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr
- nvd.nist.gov/vuln/detail/CVE-2026-33538
Code Behaviors & Features
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