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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-fcx8-ph5r-mxr4 Flight has reflected XSS through an unvalidated JSONP callback in Flight::jsonp()
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 14 May 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Flightphp
Flightphp core
Vendors & Products Flightphp
Flightphp core

Thu, 14 May 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 13 May 2026 20:00:00 +0000

Type Values Removed Values Added
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.
Title Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-14T12:32:32.147Z

Reserved: 2026-04-28T16:56:50.191Z

Link: CVE-2026-42548

cve-icon Vulnrichment

Updated: 2026-05-14T12:32:28.944Z

cve-icon NVD

Status : Received

Published: 2026-05-13T20:16:21.787

Modified: 2026-05-14T13:16:18.473

Link: CVE-2026-42548

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-14T14:33:41Z

Weaknesses