BaseFortify

Publication date: 2026-09-16

Last updated on: 2026-09-16

Assigner: VulnCheck

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-16

Last Modified

2026-09-16

Generated

2026-09-20

EPSS Evaluated

N/A

NVD

CVE-2026-92781

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1321	The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

Attack-Flow Graph

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