{"id":"CVE-2026-42548","summary":"Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()","details":"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.","aliases":["GHSA-fcx8-ph5r-mxr4"],"modified":"2026-05-18T06:00:14.302843956Z","published":"2026-05-13T19:21:44.125Z","database_specific":{"cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42548.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42548.json"},{"type":"ADVISORY","url":"https://github.com/flightphp/core/security/advisories/GHSA-fcx8-ph5r-mxr4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42548"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/flightphp/core","events":[{"introduced":"0"},{"fixed":"b8dd23aaa828cb289fa3c84e75b2a3717cab50b0"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.18.1"}],"source":"AFFECTED_FIELD"}}],"versions":["v3.18.0","v3.17.4","v3.17.3","v3.17.2","v3.17.1","v3.17.0","v3.16.1","v3.16.0","v3.15.3","v3.15.2","v3.15.1","v3.15.0","v3.14.0","v3.13.1","v3.13.0","v3.12.0","v3.11.1","v3.11.0","v3.10.1","v3.10.0","v3.9.0","v3.8.1","v3.8.0","v3.7.2","v3.7.1","v3.7.0","v3.6.2","v3.6.1","v3.6.0","v3.5.3","v3.5.2","v3.5.0","v3.4.2","v3.4.1","v3.4.0","v3.3.0","v3.2.0","v3.1.1","v3.1.0","v3.0.2","v3.0.1","v3.0.0","v2.0.1","v2.0.0","v1.3.9","v1.3.8","v1.3.7","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.22","v1.2.21","v1.2.20","v1.2.19","v1.2.18","v1.2.17","v1.2.15","v1.2.14","v1.2.13","v1.2","v1.1.10","v1.1.5","v1.1","v1.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-42548.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}