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CVE-2026-92781NVD
Vulnerability Summary
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 v4.0 Base Metrics — Score 5.3 (MEDIUM)
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionPassive
Confidentiality (Vulnerable System)Low
Integrity (Vulnerable System)Low
Availability (Vulnerable System)Low
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None
CVSS v3.1 Base Metrics — Score 6.3 (MEDIUM)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityLow
Affected & Patched Versions
- BuilderIO @builder.io/sdk-react <= 5.2.11
- BuilderIO @builder.io/sdk-vue <= 5.2.11
- BuilderIO @builder.io/sdk-svelte <= 5.2.11
- BuilderIO @builder.io/sdk-solid <= 5.2.11
- BuilderIO @builder.io/sdk-qwik <= 0.25.13
- BuilderIO @builder.io/sdk-angular <= 0.25.13
- BuilderIO @builder.io/sdk-react-nextjs <= 0.25.13
- BuilderIO @builder.io/sdk-react 5.2.11
- BuilderIO @builder.io/sdk-vue 5.2.11
- BuilderIO @builder.io/sdk-svelte 5.2.11
- BuilderIO @builder.io/sdk-solid 5.2.11
- BuilderIO @builder.io/sdk-qwik 0.25.13
- BuilderIO @builder.io/sdk-angular 0.25.13
- BuilderIO @builder.io/sdk-react-nextjs 0.25.13
External References
- https://github.com/BuilderIO/builder/issues/4824
- https://github.com/BuilderIO/builder
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-content/generate-content-url.ts
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten.ts#L60-L76
- https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-pollution-via-builder-userattributes