{"id":"CVE-2026-53609","sourceIdentifier":"security-advisories@github.com","published":"2026-06-12T22:16:52.803","lastModified":"2026-06-17T10:57:58.447","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"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":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"apostrophecms","product":"apostrophe","versions":[{"version":"<= 4.30.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"LOW"},"exploitabilityScore":3.1,"impactScore":5.3}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-15T18:29:44.669655Z","id":"CVE-2026-53609","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-1321"}]}],"references":[{"url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-6h5j-32cf-4253","source":"security-advisories@github.com"},{"url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-6h5j-32cf-4253","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}