flightphp core up to 3.18.0 Query Parameter Flight::jsonp cross site scripting

Summaryinfo

A vulnerability was found in flightphp core up to 3.18.0. It has been declared as problematic. This vulnerability affects the function Flight::jsonp of the component Query Parameter Handler. Such manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2026-42548. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in flightphp core up to 3.18.0 and classified as problematic. Affected by this issue is the function Flight::jsonp of the component Query Parameter Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-42548 since 04/28/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 3.18.1 eliminates this vulnerability.

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Productinfo

Vendor

• flightphp

Name

• core

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18.0

Website

• Product: https://github.com/flightphp/core/

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