CVE-2026-42548
Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 8.6EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
13 May 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
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
Affected products
flightphp · coreWant to know if your infrastructure is exposed to this?
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