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GHSA-5j86-7r7m-p8h6

HighCVSS 8.8 / 10

Published Mar 10, 2026·Last modified Mar 16, 2026

Affected Components(0)

No affected components available

Description

Impact

An unauthenticated attacker can crash the Parse Server process by calling a Cloud Function endpoint with a prototype property name as the function name. The server recurses infinitely, causing a call stack size error that terminates the process.

Other prototype property names bypass Cloud Function dispatch validation and return HTTP 200 responses, even though no such Cloud Functions are defined. The same applies to dot-notation traversal.

All Parse Server deployments that expose the Cloud Function endpoint are affected.

Patches

The internal handler registries for Cloud Functions, Jobs, Triggers, and Validators have been changed to prevent prototype chain properties from being resolved.

Workarounds

Place a reverse proxy or WAF in front of Parse Server and block requests to Object.prototype property names.

References

GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-5j86-7r7m-p8h6
Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.1-alpha.2
Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.13

Risk Scores

Base Score

8.8

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence

6.7

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS

0.49%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity

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