Builder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the deep-set helper function that processes content block bindings without validation. Attackers can craft content blocks with binding keys containing __proto__, prototype, or constructor paths to pollute Object.prototype during rendering, affecting all subsequent objects created in the process including other tenants' renders.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
High
Complete data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
builderio:@builder.io/sdk-react-nextjs
builderio:@builder.io/sdk-vue
builderio:@builder.io/sdk-angular
builderio:@builder.io/sdk-solid
builderio:@builder.io/sdk-react
builderio:@builder.io/sdk-svelte
builderio:@builder.io/sdk-qwik
References 5
https://github.com/BuilderIO/builder
disclosure@vulncheck.com
https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-…
disclosure@vulncheck.com
https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/set.…
disclosure@vulncheck.com
https://github.com/BuilderIO/builder/issues/4823
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-protot…
disclosure@vulncheck.com