CVE-2026-53609

CVE-2026-53609 · Apostrophe has Server-Side Prototype Pollution in apos.util.set via patch operators that leads to process-wide authorization bypass

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 9.1 · Critical · EPSS 0.3% · Fix available

Published

2026-06-12T20:59:25.486Z

Updated

2026-06-15T18:29:55.055Z

Stack: node

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