CVE-2026-92781

Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes

Published Sep 16, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Builderio
Builderio sdk-angular
Builderio sdk-qwik
Builderio sdk-react
Builderio sdk-react-nextjs
Builderio sdk-solid
Builderio sdk-svelte
Builderio sdk-vue
Vendors & Products Builderio
Builderio sdk-angular
Builderio sdk-qwik
Builderio sdk-react
Builderio sdk-react-nextjs
Builderio sdk-solid
Builderio sdk-svelte
Builderio sdk-vue
Type Values Removed Values Added
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.
Title Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes
Weaknesses CWE-1321
References
Metrics cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 21, 2026, 3:50 PM
Reserved
Sep 16, 2026, 7:22 PM
Status
Deferred
Published
Sep 16, 2026, 9:17 PM
Modified
Sep 24, 2026, 9:08 PM