CVE-2026-49143

{"id": "CVE-2026-49143", "cveTags": [{"tags": ["unsupported-when-assigned"], "sourceIdentifier": "disclosure@vulncheck.com"}], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49143", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-06-03T14:02:08.658694Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "ADJACENT", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"repo": "https://github.com/browserstack/browserstack-runner", "vendor": "browserstack", "product": "browserstack-runner", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "0.9.5"}], "packageURL": "pkg:github/browserstack/browserstack-runner", "defaultStatus": "affected"}]}], "published": "2026-06-02T21:16:28.070", "references": [{"url": "https://github.com/browserstack/browserstack-runner/security/advisories/GHSA-6vr3-7wcx-v5g5", "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/browserstack-runner-unauthenticated-rce-via-log-http-handler", "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/browserstack/browserstack-runner/security/advisories/GHSA-6vr3-7wcx-v5g5", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-94"}]}], "descriptions": [{"lang": "en", "value": "BrowserStack Runner through 0.9.5 contains a remote code execution vulnerability in the /_log HTTP handler that allows unauthenticated network-adjacent attackers to execute arbitrary code by submitting crafted JSON request bodies to the handler, which passes user-supplied data to vm.runInNewContext() combined with eval(). Attackers can escape the Node.js vm sandbox by leveraging a host-context Function reference through util.format to access the host process via this.constructor.constructor, achieving full remote code execution on the underlying system without any authentication."}, {"lang": "es", "value": "BrowserStack Runner hasta la versi\u00f3n 0.9.5 contiene una vulnerabilidad de ejecuci\u00f3n remota de c\u00f3digo en el gestor HTTP /_log que permite a atacantes adyacentes a la red sin autenticaci\u00f3n ejecutar c\u00f3digo arbitrario al enviar cuerpos de solicitud JSON manipulados al gestor, el cual pasa datos proporcionados por el usuario a vm.runInNewContext() combinado con eval(). Los atacantes pueden escapar del sandbox vm de Node.js aprovechando una referencia de funci\u00f3n de contexto de host a trav\u00e9s de util.format para acceder al proceso del host a trav\u00e9s de this.constructor.constructor, logrando una ejecuci\u00f3n remota de c\u00f3digo completa en el sistema subyacente sin autenticaci\u00f3n alguna."}], "lastModified": "2026-07-22T19:10:00.120", "sourceIdentifier": "disclosure@vulncheck.com"}