CVE-2026-92781
mediumBuilder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the unflatten helper that processes builder.userAttribu…
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:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/BuilderIO/builder disclosure@vulncheck.com
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-content/gen... disclosure@vulncheck.com
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten.ts#L60-L7... disclosure@vulncheck.com
- https://github.com/BuilderIO/builder/issues/4824 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-polluti... disclosure@vulncheck.com
- https://github.com/BuilderIO/builder/issues/4824 134c704f-9b21-4f2e-91b3-4a467353bcc0