CVE-2026-92781
Medium
Description
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 links with __proto__ or prototype segments to pollute Object.prototype in a visitor's browser when the SDK processes the malicious URL.
SeverityMedium
CVSS6.3
Exploit probability—
ProductBuilderio @builder.io/sdk-react
PublishedSep 16, 2026
First seenSep 16, 2026
Weakness typeCWE-1321Prototype pollution
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| BuilderIO @builder.io/sdk-react | v ≤ 5.2.11 | — |
| BuilderIO @builder.io/sdk-vue | v ≤ 5.2.11 | — |
| BuilderIO @builder.io/sdk-svelte | v ≤ 5.2.11 | — |
| BuilderIO @builder.io/sdk-solid | v ≤ 5.2.11 | — |
| BuilderIO @builder.io/sdk-qwik | v ≤ 0.25.13 | — |
| BuilderIO @builder.io/sdk-angular | v ≤ 0.25.13 | — |
| BuilderIO @builder.io/sdk-react-nextjs | v ≤ 0.25.13 | — |
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