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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
flightphp core affected
Version Status Constraints
< 3.18.1 affected —

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Project Subscriptions

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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.

References
Link Providers
https://github.com/flightphp/core/security/advisories/GHSA-fcx8-ph5r-mxr4 cve-icon cve-icon
History

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: 2026-05-13T19:21:44.125Z

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

Link: CVE-2026-42548

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-42548

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-13T21:45:05Z

Weaknesses