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Advisories

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

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severity
medium
date
Affecting

  • @builder.io/sdk-react <= 5.2.11

  • @builder.io/sdk-vue <= 5.2.11

  • @builder.io/sdk-svelte <= 5.2.11

  • @builder.io/sdk-solid <= 5.2.11

  • @builder.io/sdk-qwik <= 0.25.13

  • @builder.io/sdk-angular <= 0.25.13

  • @builder.io/sdk-react-nextjs <= 0.25.13

CWE
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CVSS
5.3
CVSS V4 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
Credit
George Chen
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.

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