CVE-2026-33430

HIGH EPSS 3.1%
Published Mar 26, 20263mo ago · Modified Jun 17, 20262w ago
7.3 CVSS 3.1
High
Find Similar
Published Mar 26, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
7.3
Exploitability
1.3
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
3.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-732

Affected Products 1

VendorProductVersionRange
beewarebriefcase*≥0.3.0  –  <0.3.26

References 4

  • github.com https://github.com/beeware/briefcase-windows-VisualStudio-template/pull/85
    Issue TrackingPatch
  • github.com https://github.com/beeware/briefcase-windows-app-template/pull/86
    Issue TrackingPatch
  • github.com https://github.com/beeware/briefcase/issues/2759
    Issue Tracking
  • github.com https://github.com/beeware/briefcase/security/advisories/GHSA-r3r2-35v9-v238
    MitigationPatchVendor Advisory

Remediation

  • github.com https://github.com/beeware/briefcase-windows-VisualStudio-template/pull/85
    Issue TrackingPatch
  • github.com https://github.com/beeware/briefcase-windows-app-template/pull/86
    Issue TrackingPatch
  • github.com https://github.com/beeware/briefcase/security/advisories/GHSA-r3r2-35v9-v238
    MitigationPatchVendor Advisory