CVE-2026-92781 — Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes
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 paramete…
Published: 2026-09-16 · CVSS: 5.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7