CVE-2026-33538

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.58 and 9.6.0-alpha.52, 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. This issue has been patched in versions 8.6.58 and 9.6.0-alpha.52.

References

• https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357
• https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54
• https://github.com/parse-community/parse-server/pull/10270
• https://github.com/parse-community/parse-server/pull/10271
• https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr