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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/BuilderIO/builder
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-c
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten
- https://github.com/BuilderIO/builder/issues/4824
- https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototy
FAQ
What is CVE-2026-92781?
CVE-2026-92781 is a vulnerability with a CVSS score of 6.3 (MEDIUM). 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 gu...
How severe is CVE-2026-92781?
CVE-2026-92781 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-92781?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.