CVE-2026-42549: Flightphp Core

Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Flight is an extensible micro-framework for PHP. Prior to 3.18.1, the make:controller CLI command calls mkdir(..., recursive: true) on a path built from the user-supplied controller name, before Nette's class-name validation runs. The class-file write is correctly rejected by Nette when the name contains /, but the recursive directory creation side effect is already committed — including directories located outside the project root through ../ traversal. This vulnerability is fixed in 3.18.1.

Affected products

• Flightphp Core: before 3.18.1 (fixed in 3.18.1)

Published 2026-05-13. Last modified 2026-06-17.