CVE-2026-92781— Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes
Quick assessment
Affected
BuilderIO @builder.io/sdk-react
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
以下是该段漏洞描述的专业中文翻译： Builder.io Gen2 SDK 在 5.2.11 及 0.25.13 等版本中，其 辅助函数在处理 查询参数时，未对原型属性进行防护，从而存在原型链污染（prototype pollution）漏洞。攻击者可构造包含 或 字段的预览链接；当 SDK 处理该恶意 URL 时，会在访问者的浏览器中污染 。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 7
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| BuilderIO | @builder.io/sdk-angular | ≤ 0.25.13 |
affected |
| BuilderIO | @builder.io/sdk-qwik | ≤ 0.25.13 |
affected |
| BuilderIO | @builder.io/sdk-react | ≤ 5.2.11 |
affected |
| BuilderIO | @builder.io/sdk-react-nextjs | ≤ 0.25.13 |
affected |
| BuilderIO | @builder.io/sdk-solid | ≤ 5.2.11 |
affected |
| BuilderIO | @builder.io/sdk-svelte | ≤ 5.2.11 |
affected |
| BuilderIO | @builder.io/sdk-vue | ≤ 5.2.11 |
affected |
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I. Basic Information for CVE-2026-92781
Vulnerability Information
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Vulnerability Title
Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| BuilderIO | @builder.io/sdk-react | 0 ~ 5.2.11 | - |
|
| BuilderIO | @builder.io/sdk-vue | 0 ~ 5.2.11 | - |
|
| BuilderIO | @builder.io/sdk-svelte | 0 ~ 5.2.11 | - |
|
| BuilderIO | @builder.io/sdk-solid | 0 ~ 5.2.11 | - |
|
| BuilderIO | @builder.io/sdk-qwik | 0 ~ 0.25.13 | - |
|
| BuilderIO | @builder.io/sdk-angular | 0 ~ 0.25.13 | - |
|
| BuilderIO | @builder.io/sdk-react-nextjs | 0 ~ 0.25.13 | - |
|
II. Public POCs for CVE-2026-92781
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-92781 (5)
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🔗 builder/packages/sdks/src/helpers/flatten.ts at main · BuilderIO/builder · GitHub technical-description
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IV. Related Vulnerabilities
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-
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Same weakness: CWE-1321
-
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Yayson: Prototype pollution in the Store/LegacyStore deseria
V. Comments for CVE-2026-92781
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