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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-10 · updated 2026-06-17
• Weakness: CWE-799

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.

Affected products

• parse-community parse-server: before 8.6.23; from 9.0.0 before 9.5.2; 9.5.2-alpha1, 9.5.2-alpha2, 9.5.2-alpha3, 9.5.2-alpha4, 9.5.2-alpha5, 9.5.2-alpha6 (+3) — fixed in 8.6.23, 9.5.2

How to fix

Upgrade to a fixed version: parse-community parse-server 8.6.23, 9.5.2. Check the vendor advisory for mitigations.

References

• 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
• https://github.com/parse-community/parse-server/security/advisories/GHSA-775h-3xrc-c228

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