# CVE-2026-33538

## Summary

- **CVE ID:** CVE-2026-33538
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-400
- **Published:** Mar 24, 2026
- **Last Modified:** Mar 24, 2026

## 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.

## Affected Products

- parse-community — parse-server (< 8.6.58)
- parse-community — parse-server (>= 9.0.0, < 9.6.0-alpha.52)

## References

- [CNA](https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr)
- [CNA](https://github.com/parse-community/parse-server/pull/10270)
- [CNA](https://github.com/parse-community/parse-server/pull/10271)
- [CNA](https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357)
- [CNA](https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.41%
- **EPSS Percentile:** 34.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._