high8.6
CVE-2026-42548
Flight has reflected XSS through an unvalidated JSONP callback in Flight::jsonp()
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | flightphp/core | < 3.18.1 | 3.18.1 |