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.

PUBLISHED Reserved 2026-04-28 | Published 2026-05-13 | Updated 2026-05-14 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

References

github.com/...p/core/security/advisories/GHSA-fcx8-ph5r-mxr4 exploit

github.com/...p/core/security/advisories/GHSA-fcx8-ph5r-mxr4

cve.org (CVE-2026-42548)

nvd.nist.gov (CVE-2026-42548)

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