{"id":"CVE-2026-92781","title":"Builder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the unflatten helper that processes builder.userAttributes query parameters without prototype guards","summary":"Builder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the unflatten helper that processes builder.userAttributes query parameters without prototype guards. Attackers can craft preview lin…","severity":"medium","cvss":6.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","cwe":["CWE-1321"],"vendor":"BuilderIO","product":"@builder.io/sdk-react","affected":["@builder.io/sdk-react <= 5.2.11","@builder.io/sdk-vue <= 5.2.11","@builder.io/sdk-svelte <= 5.2.11","@builder.io/sdk-solid <= 5.2.11","@builder.io/sdk-qwik <= 0.25.13","@builder.io/sdk-angular <= 0.25.13","@builder.io/sdk-react-nextjs <= 0.25.13"],"published":"2026-09-16","updated":"2026-09-21","sourceUpdated":"2026-09-21T16:17:27.090","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92781","references":[{"url":"https://github.com/BuilderIO/builder","label":"disclosure@vulncheck.com"},{"url":"https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-content/generate-content-url.ts","label":"disclosure@vulncheck.com"},{"url":"https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten.ts#L60-L76","label":"disclosure@vulncheck.com"},{"url":"https://github.com/BuilderIO/builder/issues/4824","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-pollution-via-builder-userattributes","label":"disclosure@vulncheck.com"},{"url":"https://github.com/BuilderIO/builder/issues/4824","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-21T15:50:07.571574Z"},"epss":0.00259,"epssPercentile":0.17849,"ingestedAt":"2026-09-16T21:05:36.890Z","slug":"CVE-2026-92781","body":"## Overview\n\nBuilder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the unflatten helper that processes builder.userAttributes query parameters without prototype guards. Attackers can craft preview links with __proto__ or prototype segments to pollute Object.prototype in a visitor's browser when the SDK processes the malicious URL.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":34.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":208525,"id":"CVE-2026-92781","ts":1790007735748,"field":"exploit_available","old":"false","new":"true"}]}