High

Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()

Type: advisorySources: OSV

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.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-42548
Confirmed fixed CVEs: Not specified
Updated in this feed: 7 Nov 2026, 02:47 UTC · Revision 1

Source evidence

Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()

core-osv · Original source

Published 13 May 2026, 19:21 UTC

osv:CVE-2026-42548

Complete source record

{
  "id": "6f159c7f2f1342ef2b229ec2df80842fa2564cf41bf776d1f96b811619fb9cbe",
  "url": "https://osv.dev/vulnerability/CVE-2026-42548",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()",
    "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.",
    "evidence": "osv:CVE-2026-42548",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-42548",
      "aliases": [
        "CVE-2026-42548",
        "GHSA-fcx8-ph5r-mxr4"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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": [
        {
          "ranges": [
            {
              "repo": "https://github.com/flightphp/core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b8dd23aaa828cb289fa3c84e75b2a3717cab50b0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.18.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.18.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.18.0",
            "v3.17.4",
            "v3.17.3",
            "v3.17.2",
            "v3.17.1",
            "v3.17.0",
            "v3.16.1",
            "v3.16.0",
            "v3.15.3",
            "v3.15.2",
            "v3.15.1",
            "v3.15.0",
            "v3.14.0",
            "v3.13.1",
            "v3.13.0",
            "v3.12.0",
            "v3.11.1",
            "v3.11.0",
            "v3.10.1",
            "v3.10.0",
            "v3.9.0",
            "v3.8.1",
            "v3.8.0",
            "v3.7.2",
            "v3.7.1",
            "v3.7.0",
            "v3.6.2",
            "v3.6.1",
            "v3.6.0",
            "v3.5.3",
            "v3.5.2",
            "v3.5.0",
            "v3.4.2",
            "v3.4.1",
            "v3.4.0",
            "v3.3.0",
            "v3.2.0",
            "v3.1.1",
            "v3.1.0",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0",
            "v2.0.1",
            "v2.0.0",
            "v1.3.9",
            "v1.3.8",
            "v1.3.7",
            "v1.3.5",
            "v1.3.4",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.22",
            "v1.2.21",
            "v1.2.20",
            "v1.2.19",
            "v1.2.18",
            "v1.2.17",
            "v1.2.15",
            "v1.2.14",
            "v1.2.13",
            "v1.2",
            "v1.1.10",
            "v1.1.5",
            "v1.1",
            "v1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42548.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.059029263Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42548.json",
        "https://github.com/flightphp/core/security/advisories/GHSA-fcx8-ph5r-mxr4",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42548"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42548.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42548",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517482,
  "published_at": "2026-05-13T19:21:44.125+00:00"
}