CVE-2026-53609: 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…

PriorityP262critical9.1CVSS 3.1

AVNACLPRLUINSCCHILAL

EPSS

0.24%

14.6th percentile

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

1 ranges

Vendor	Product	Version range	Fixed in
apostrophecms	apostrophe	<= 4.30.0	—

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