---
id: CVE-2026-71553
aliases:
  - GHSA-vmg4-6gfg-83qx
title: >-
  ApostropheCMS: 2nd-order prototype pollution via PATCH leading to
  single-request persistent DoS
summary: >-
  ApostropheCMS: 2nd-order prototype pollution via PATCH leading to
  single-request persistent DoS
severity: high
cwe:
  - CWE-1321
vendor: apostrophe
product: apostrophe
ecosystem: npm
affected:
  - apostrophe <= 4.32.0
published: '2026-09-02'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T12:47:18Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-vmg4-6gfg-83qx'
references:
  - url: >-
      https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-vmg4-6gfg-83qx
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71553'
  - url: >-
      https://github.com/apostrophecms/apostrophe/commit/5a3746aaed49761e171c2cbfe793267c959829fd
  - url: 'https://github.com/advisories/GHSA-vmg4-6gfg-83qx'
tags:
  - ghsa
  - npm
  - nvd
epss: 0.00429
epssPercentile: 0.34512
ingestedAt: '2026-09-02T15:46:29.619Z'
---

## Overview

The vulnerability is a single-request persistent DoS by submitting e.g.
"PATCH /api/v1/article/<id>" with a valid editor session and body of
{"toString.call":"x"}, overwriting the global toString function with
value x.

Fabian

## Affected packages

- `apostrophe <= 4.32.0`

## Remediation

Refer to the advisory for the patched release.