{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-92781", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-16T19:22:53.825Z", "datePublished": "2026-09-16T20:32:38.923Z", "dateUpdated": "2026-09-16T20:32:38.923Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-16T20:32:38.923Z"}, "datePublic": "2026-08-25T00:00:00.000Z", "title": "Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')", "cweId": "CWE-1321", "type": "CWE"}]}], "affected": [{"vendor": "BuilderIO", "product": "@builder.io/sdk-react", "defaultStatus": "unaffected", "packageURL": "pkg:npm/%40builder.io/sdk-react", "versions": [{"version": "0", "lessThanOrEqual": "5.2.11", "status": "affected", "versionType": "semver"}]}, {"vendor": "BuilderIO", "product": "@builder.io/sdk-vue", "defaultStatus": "unaffected", "packageURL": "pkg:npm/%40builder.io/sdk-vue", "versions": [{"version": "0", "lessThanOrEqual": "5.2.11", "status": "affected", "versionType": "semver"}]}, {"vendor": "BuilderIO", "product": "@builder.io/sdk-svelte", "defaultStatus": "unaffected", "packageURL": "pkg:npm/%40builder.io/sdk-svelte", "versions": [{"version": "0", "lessThanOrEqual": "5.2.11", "status": "affected", "versionType": "semver"}]}, {"vendor": "BuilderIO", "product": "@builder.io/sdk-solid", "defaultStatus": "unaffected", "packageURL": "pkg:npm/%40builder.io/sdk-solid", "versions": [{"version": "0", "lessThanOrEqual": "5.2.11", "status": "affected", "versionType": "semver"}]}, {"vendor": "BuilderIO", "product": "@builder.io/sdk-qwik", "defaultStatus": "unaffected", "packageURL": "pkg:npm/%40builder.io/sdk-qwik", "versions": [{"version": "0", "lessThanOrEqual": "0.25.13", "status": "affected", "versionType": "semver"}]}, {"vendor": "BuilderIO", "product": "@builder.io/sdk-angular", "defaultStatus": "unaffected", "packageURL": "pkg:npm/%40builder.io/sdk-angular", "versions": [{"version": "0", "lessThanOrEqual": "0.25.13", "status": "affected", "versionType": "semver"}]}, {"vendor": "BuilderIO", "product": "@builder.io/sdk-react-nextjs", "defaultStatus": "unaffected", "packageURL": "pkg:npm/%40builder.io/sdk-react-nextjs", "versions": [{"version": "0", "lessThanOrEqual": "0.25.13", "status": "affected", "versionType": "semver"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "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", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/BuilderIO/builder/issues/4824", "tags": ["issue-tracking"], "name": "GitHub Issue #4824"}, {"url": "https://github.com/BuilderIO/builder", "tags": ["product"]}, {"url": "https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-content/generate-content-url.ts", "tags": ["technical-description"], "name": "builder.userAttributes parameters are expanded through unflatten"}, {"url": "https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten.ts#L60-L76", "tags": ["technical-description"], "name": "unflatten walks the dotted key path with no prototype guard"}, {"name": "VulnCheck Advisory: Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-pollution-via-builder-userattributes"}], "credits": [{"lang": "en", "value": "George Chen", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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