CVE-2026-33430

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{"affected": [{"affectedData": [{"product": "briefcase", "vendor": "beeware", "versions": [{"status": "affected", "version": ">= 0.3.0, < 0.3.26"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:beeware:briefcase:*:*:*:*:*:python:*:*", "matchCriteriaId": "3D61980B-527F-4394-A07A-CA15AE1D928A", "versionEndExcluding": "0.3.26", "versionStartIncluding": "0.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Briefcase is a tool for converting a Python project into a standalone native application. Starting in version 0.3.0 and prior to version 0.3.26, if a developer uses Briefcase to produce an Windows MSI installer for a project, and that project is installed for All Users (i.e., per-machine scope), the installation process creates an directory that inherits all the permissions of the parent directory. Depending on the location chosen by the installing user, this may allow a low privilege but authenticated user to replace or modify the binaries installed by the application. If an administrator then runs the altered binary, the binary will run with elevated privileges. The problem is caused by the template used to generate the WXS file for Windows projects. It was fixed in the templates used in Briefcase 0.3.26, 0.4.0, and 0.4.1. Re-running `briefcase create` on your Briefcase project will result in the updated templates being used. As a workaround, the patch can be added to any existing Briefcase .wxs file generated by Briefcase 0.3.24 or later."}, {"lang": "es", "value": "Briefcase es una herramienta para convertir un proyecto Python en una aplicaci\u00f3n nativa independiente. A partir de la versi\u00f3n 0.3.0 y antes de la versi\u00f3n 0.3.26, si un desarrollador utiliza Briefcase para producir un instalador MSI de Windows para un proyecto, y ese proyecto se instala para Todos los Usuarios (es decir, con alcance por m\u00e1quina), el proceso de instalaci\u00f3n crea un directorio que hereda todos los permisos del directorio padre. Dependiendo de la ubicaci\u00f3n elegida por el usuario que realiza la instalaci\u00f3n, esto puede permitir que un usuario con pocos privilegios pero autenticado reemplace o modifique los binarios instalados por la aplicaci\u00f3n. Si un administrador ejecuta entonces el binario alterado, el binario se ejecutar\u00e1 con privilegios elevados. El problema es causado por la plantilla utilizada para generar el archivo WXS para proyectos de Windows. Fue solucionado en las plantillas utilizadas en Briefcase 0.3.26, 0.4.0 y 0.4.1. Volver a ejecutar 'briefcase create' en su proyecto Briefcase resultar\u00e1 en el uso de las plantillas actualizadas. Como soluci\u00f3n alternativa, el parche puede a\u00f1adirse a cualquier archivo .wxs de Briefcase existente generado por Briefcase 0.3.24 o posterior."}], "id": "CVE-2026-33430", "lastModified": "2026-06-17T10:37:29.233", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33430", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-31T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-03-26T17:16:38.713", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/beeware/briefcase-windows-VisualStudio-template/pull/85"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/beeware/briefcase-windows-app-template/pull/86"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/beeware/briefcase/issues/2759"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Patch", "Vendor Advisory"], "url": "https://github.com/beeware/briefcase/security/advisories/GHSA-r3r2-35v9-v238"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-732"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.3.0,0.3.26)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "briefcase", "source": "cna", "vendor": "beeware"}, "product": "briefcase", "vendor": "beeware"}], "analysis": {"en": {"generated_at": "2026-03-26T18:36:52.924571+00:00", "value": {"mitigation_remediation": ["Upgrade Briefcase to version 0.3.26 or later", "Re\u2011run briefcase create on your project to regenerate the updated WXS templates", "If upgrading immediately is not possible, apply the patch to any existing .wxs file generated by Briefcase 0.3.24 through 0.3.25", "Avoid installing MSI packages in an All Users scope when using an older Briefcase version"], "summary": {"action": "Immediate Patch", "impact": "Privilege Escalation"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Briefcase versions 0.3.0 up to and including 0.3.25. Repairs were introduced in Briefcase 0.3.26, and the same templates used in 0.4.0 and 0.4.1 remain secure. Users deploying earlier releases on Windows systems must verify they are not using these vulnerable ranges.", "description_and_impact": "Briefcase creates an MSI installer that, when installed for All Users, generates a supporting directory which inherits the parent directory's permissions. The inherited permissions allow a low\u2011privileged but authenticated user to replace or modify binaries installed by the application. If an administrator later executes the altered binary, it runs with elevated privileges. This flaw is a classic directory traversal/permission issue, classified as CWE\u2011732 and representing a high\u2011severity privilege escalation risk.", "risk_and_exploitability": "The CVSS score of 7.3 reflects a high risk once the vulnerability is exploited. Although no EPSS value is available and the flaw is not yet listed in the CISA KEV catalog, the attack model is locally feasible: a legitimate user who can install an MSI for All Users can modify the files. An attacker would need to influence the MSI installation path or intentionally place the installer in a privileged directory. Once the binaries are altered, the attacker can gain elevated privileges on the host if an administrator subsequently runs the tampered executable. Given the local nature of the attack, containment requires restricting MSI install scope or promptly applying the vendor patch."}}}}, "created": "2026-03-27T08:33:41.114602+00:00", "updated": "2026-03-27T09:26:06.578875+00:00", "vendors": ["beeware", "beeware$PRODUCT$briefcase"]}