---
title: "CVE-2026-31871: Parse Server vulnerable to SQL Injection via dot-notation sub-key name in `Increment` operation on PostgreSQL"
url: https://erroneo.us/security/cve/CVE-2026-31871/
description: "CVE-2026-31871 (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: 2026-03-11
date_modified: 2026-03-12
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-31871"
kev: false
cvss: 9.3
epss: 0.00566
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-31871: Parse Server vulnerable to SQL Injection via dot-notation sub-key name in `Increment` operation on PostgreSQL

**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 0.6% , percentile 46: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 46% 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, < 9.6.0-alpha.5, fixed in 9.6.0-alpha.5 ; parse-server (npm) < 8.6.31, fixed in 8.6.31 . 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 9.6.0-alpha.5 and 8.6.31, a SQL injection vulnerability exists in the PostgreSQL storage adapter when processing Increment operations on nested object fields using dot notation (e.g., stats.counter). The sub-key name is interpolated directly into SQL string literals without escaping. An attacker who can send write requests to the Parse Server REST API can inject arbitrary SQL via a crafted sub-key name containing single quotes, potentially executing commands or reading data from the database, bypassing CLPs and ACLs. Only Postgres deployments are affected. This vulnerability is fixed in 9.6.0-alpha.5 and 8.6.31.

## Affected packages

- npm `parse-server` >= 9.0.0-alpha.1, < 9.6.0-alpha.5 → fixed: 9.6.0-alpha.5
- npm `parse-server` < 8.6.31 → fixed: 8.6.31

## Affected products (CVE record)

- parse-community parse-server: >= 9.0.0 < 9.6.0-alpha.5, < 8.6.31

## Severity

- GitHub_M CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## 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): 0.57% probability of exploitation activity in the next 30 days; percentile 46.

## Sources

- [GitHub Advisory GHSA-gqpp-xgvh-9h7h](https://github.com/advisories/GHSA-gqpp-xgvh-9h7h)
- [CVE.org record CVE-2026-31871](https://www.cve.org/CVERecord?id=CVE-2026-31871)
- [NVD entry CVE-2026-31871](https://nvd.nist.gov/vuln/detail/CVE-2026-31871)
- [github.com](https://github.com/parse-community/parse-server/security/advisories/GHSA-gqpp-xgvh-9h7h)
- [github.com](https://github.com/parse-community/parse-server/releases/tag/8.6.31)
- [github.com](https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.5)

---
Source page: https://erroneo.us/security/cve/CVE-2026-31871/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt