CVE-2026-42548

Description

Flight is an extensible micro-framework for PHP. Prior to 3.18.1, Flight::jsonp() concatenates the ?jsonp= query parameter directly into an application/javascript response body without validating that the value is a legal JavaScript identifier. An attacker can inject arbitrary JavaScript that executes in the response origin, enabling reflected cross-site scripting. This vulnerability is fixed in 3.18.1.

References

• https://github.com/flightphp/core/security/advisories/GHSA-fcx8-ph5r-mxr4
• https://github.com/flightphp/core/security/advisories/GHSA-fcx8-ph5r-mxr4