CVE-2026-92781
Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes
CVSS Score
6.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1321 |
| Vendor | builderio |
| Product | @builder.io/sdk-react |
| Published | Sep 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
Affected Versions
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
References
github.com: https://github.com/BuilderIO/builder/issues/4824 github.com: https://github.com/BuilderIO/builder github.com: https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-content/generate-content-url.ts github.com: https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten.ts#L60-L76 vulncheck.com: https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-pollution-via-builder-userattributes
Credits
George Chen