Cloudanix VulnDB

CVE-2026-53609

Critical · 9.1

CVSS

9.1

EPSS

0.4%

Published

Jun 12, 2026

CISA due date

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The record

ApostropheCMS is an open-source Node.js content management system. In versions up to and including 4.30.0, `apos.util.set()` traverses dot-notation paths without sanitizing `__proto__`, allowing an authenticated editor to write arbitrary values to `Object.prototype` via the `$pullAll` patch operator. A confirmed gadget in `publicApiCheck()` causes this to bypass authorization on all piece-type REST API endpoints for every subsequent unauthenticated request, for the lifetime of the Node.js process. As of time of publication, no known patched versions are available.

Affected packages

Ecosystem Package Introduced Fixed

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