{"cve":"CVE-2026-33430","nvd":{"published":"2026-03-26T17:16:38.713","modified":"2026-06-17T10:37:29.233","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","score":7.3},"cwes":["CWE-732"],"references":["https://github.com/beeware/briefcase-windows-VisualStudio-template/pull/85","https://github.com/beeware/briefcase-windows-app-template/pull/86","https://github.com/beeware/briefcase/issues/2759","https://github.com/beeware/briefcase/security/advisories/GHSA-r3r2-35v9-v238"],"products":["beeware:briefcase"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-33430","score":0.00137,"percentile":0.03113,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-r3r2-35v9-v238","url":"https://osv.dev/vulnerability/GHSA-r3r2-35v9-v238","summary":"Briefcase: Windows MSI Installer Privilege Escalation via Insecure Directory Permissions ","modified":"2026-06-05T14:30:11.172961403Z","packages":[{"ecosystem":"PyPI","name":"briefcase","purl":"pkg:pypi/briefcase","ranges":[">=0.3.0 <0.3.26"],"fixed":["0.3.26"]}]},{"id":"PYSEC-2026-27","url":"https://osv.dev/vulnerability/PYSEC-2026-27","summary":"","modified":"2026-05-20T09:18:53.838122Z","packages":[{"ecosystem":"PyPI","name":"briefcase","purl":"pkg:pypi/briefcase","ranges":[">=0.3.0 <0.3.26"],"fixed":["0.3.26"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}