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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.
Severity Level
MEDIUM(6.3)
Published Date
Sep 16, 2026
Last Modified
Sep 21, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.26%Probability
Root Weakness (CWE)
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
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

Affected 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
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
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📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
⚙️Custom EPSS — Filter noise, focus on risk.
💬Webhooks — Slack & Teams integration.
🚫Ad-Free — Uninterrupted experience.