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CVE-2026-42548— Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()

Quick assessment

Affected
flightphp core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Flight是Mike Cao个人开发者的一个PHP微框架。 Flight 3.18.1之前版本存在跨站脚本漏洞，该漏洞源于Flight::jsonp()将?jsonp=查询参数直接连接到application/javascript响应体中，未验证值是否为合法JavaScript标识符，可能导致反射型跨站脚本攻击。

AI Predicted 6.1 Difficulty: Trivial EPSS 0.50% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
flightphp core < 3.18.1 affected
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I. Basic Information for CVE-2026-42548

Vulnerability Information
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Vulnerability Title
Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Flight 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flight是Mike Cao个人开发者的一个PHP微框架。 Flight 3.18.1之前版本存在跨站脚本漏洞，该漏洞源于Flight::jsonp()将?jsonp=查询参数直接连接到application/javascript响应体中，未验证值是否为合法JavaScript标识符，可能导致反射型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
flightphp core < 3.18.1 -

II. Public POCs for CVE-2026-42548

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III. Intelligence Information for CVE-2026-42548

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Vendor Advisories for CVE-2026-42548 (1)

Same Patch Batch · flightphp · 2026-05-13 · 5 CVEs total

CVE-2026-42550 8.8 HIGH Flight: SQL Injection via unvalidated identifiers in SimplePdo::insert / update / delete
CVE-2026-42552 7.5 HIGH Flight: Sensitive information disclosure via default error handler in flightphp/core
CVE-2026-42551 7.5 HIGH Flight: HTTP method override enabled by default enables CSRF escalation and middleware byp
CVE-2026-42549 4.4 MEDIUM Flight: Path traversal in `make:controller` CLI creates arbitrary directories outside proj

IV. Related Vulnerabilities

Same product: core
Same vendor: flightphp
Same weakness: CWE-79

V. Comments for CVE-2026-42548

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