Vulnerability details
CVE-2026-42548
flightphp core
Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()
CVSS 4.0
8.6High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.6High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | 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
| Vendor | Product | Versions | Source |
|---|---|---|---|
| flightphp | core | < 3.18.1 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/flightphp/core/security/advisories/GHSA-fcx8-ph5r-mxr4 x_refsource_CONFIRM
Kolun on Telegram @kolunsec
Exploited CVEs, key news and a daily digest
Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.
Details
- Published
- 2026-05-13
- Last updated
- 2026-05-14
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.44%
Probability of exploitation in 30 days
39.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')