---
title: "CVE-2026-30966: Parse Server has role escalation and CLP bypass via direct `_Join` table write"
url: https://erroneo.us/security/cve/CVE-2026-30966/
description: "CVE-2026-30966 (parse-server (npm)): Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-10
date_modified: 2026-03-11
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-30966"
kev: false
cvss: 10
epss: 0.00536
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-30966: Parse Server has role escalation and CLP bypass via direct `_Join` table write

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 44: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 44% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes parse-server (npm) >= 9.0.0-alpha.1, < 9.5.2-alpha.7, fixed in 9.5.2-alpha.7 ; parse-server (npm) < 8.6.20, fixed in 8.6.20 . Check your lockfile, including transitive dependencies.

## What it is

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.7 and 8.6.20, Parse Server's internal tables, which store Relation field mappings such as role memberships, can be directly accessed via the REST API or GraphQL API by any client using only the application key. No master key is required. An attacker can create, read, update, or delete records in any internal relationship table. Exploiting this allows the attacker to inject themselves into any Parse Role, gaining all permissions associated with that role, including full read, write, and delete access to classes protected by role-based Class-Level Permissions (CLP). Similarly, writing to any such table that backs a Relation field used in a pointerFields CLP bypasses that access control. This vulnerability is fixed in 9.5.2-alpha.7 and 8.6.20.

## Affected packages

- npm `parse-server` >= 9.0.0-alpha.1, < 9.5.2-alpha.7 → fixed: 9.5.2-alpha.7
- npm `parse-server` < 8.6.20 → fixed: 8.6.20

## Affected products (CVE record)

- parse-community parse-server: >= 9.0.0 < 9.5.2-alpha.7, < 8.6.20

## Severity

- GitHub_M CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L`
- GitHub CVSS 3.1: 10.0 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.54% probability of exploitation activity in the next 30 days; percentile 44.

## Sources

- [GitHub Advisory GHSA-5f92-jrq3-28rc](https://github.com/advisories/GHSA-5f92-jrq3-28rc)
- [CVE.org record CVE-2026-30966](https://www.cve.org/CVERecord?id=CVE-2026-30966)
- [NVD entry CVE-2026-30966](https://nvd.nist.gov/vuln/detail/CVE-2026-30966)
- [github.com](https://github.com/parse-community/parse-server/security/advisories/GHSA-5f92-jrq3-28rc)
- [github.com](https://github.com/parse-community/parse-server/releases/tag/8.6.20)
- [github.com](https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.7)

---
Source page: https://erroneo.us/security/cve/CVE-2026-30966/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt