Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()
Priority HIGH 78CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00449 39th percentileScored 2026-11-07
Fix Fixed core (flightphp): 3.18.1flightphp/core (Packagist): 3.18.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| flightphp | core | before 3.18.1 | 3.18.1 | Patch available | CNA |
| — | flightphp/core (Packagist) | before 3.18.1 | 3.18.1 | Patch available | GHSA-fcx8-ph5r-mxr4 |
- core Vendorflightphp Affected before 3.18.1 Fixed in 3.18.1 Patch available CNA
- flightphp/core (Packagist) Vendor— Affected before 3.18.1 Fixed in 3.18.1 Patch available GHSA-fcx8-ph5r-mxr4
Remediation
- Fix · CNA core (flightphp) Fixed in 3.18.1
- Fix · GHSA-fcx8-ph5r-mxr4 flightphp/core (Packagist) Fixed in 3.18.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-42548
- 2026-10-03 Alias added: GHSA-fcx8-ph5r-mxr4
References
More flightphp vulnerabilities
- TI-2026-30830 Flight: SQL Injection via unvalidated identifiers in SimplePdo::insert / update / delete CVSS 3.1HIGH 8.8
- TI-2026-30832 Flight: Sensitive information disclosure via default error handler in flightphp/core CVSS 3.1HIGH 7.5
- TI-2026-30831 Flight: HTTP method override enabled by default enables CSRF escalation and middleware bypass in flightphp/core CVSS 3.1HIGH 7.5
- TI-2014-08426 Denial of Service (DoS) vulnerability in mikecao/flight CVSS 3.1HIGH 7.5
- TI-2026-30829 Flight: Path traversal in `make:controller` CLI creates arbitrary directories outside project root CVSS 3.1MEDIUM 4.4
Sources
- CVE-2026-42548 · CVE Program
- CVE-2026-42548 · NVD
- FIRST EPSS
- GHSA-fcx8-ph5r-mxr4 · GitHub Advisory Database · CC BY 4.0
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