---
title: "CVE-2026-31856: Parse Server vulnerable to SQL injection via `Increment` operation on nested object field in PostgreSQL"
url: https://erroneo.us/security/cve/CVE-2026-31856/
description: "CVE-2026-31856 (parse-server (npm)): Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. A SQL injection…"
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-2026-31856"
kev: false
cvss: 9.3
epss: 0.00566
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-31856: Parse Server vulnerable to SQL injection via `Increment` operation on nested object field in 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.3, fixed in 9.6.0-alpha.3 ; parse-server (npm) < 8.6.29, fixed in 8.6.29 . 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. 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 amount value is interpolated directly into the SQL query without parameterization or type validation. An attacker who can send write requests to the Parse Server REST API can inject arbitrary SQL subqueries to read any data from the database, bypassing CLPs and ACLs. MongoDB deployments are not affected. This vulnerability is fixed in 9.6.0-alpha.3 and 8.6.29.

## Affected packages

- npm `parse-server` >= 9.0.0-alpha.1, < 9.6.0-alpha.3 → fixed: 9.6.0-alpha.3
- npm `parse-server` < 8.6.29 → fixed: 8.6.29

## Affected products (CVE record)

- parse-community parse-server: >= 9.0.0 < 9.6.0-alpha.3, < 8.6.29

## 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:N/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:N/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-q3vj-96h2-gwvg](https://github.com/advisories/GHSA-q3vj-96h2-gwvg)
- [CVE.org record CVE-2026-31856](https://www.cve.org/CVERecord?id=CVE-2026-31856)
- [NVD entry CVE-2026-31856](https://nvd.nist.gov/vuln/detail/CVE-2026-31856)
- [github.com](https://github.com/parse-community/parse-server/security/advisories/GHSA-q3vj-96h2-gwvg)
- [github.com](https://github.com/parse-community/parse-server/releases/tag/8.6.29)
- [github.com](https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.3)

---
Source page: https://erroneo.us/security/cve/CVE-2026-31856/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt