{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "2.8.0"
              },
              {
                "fixed": "2.36.0"
              },
              {
                "introduced": "3.0.0"
              },
              {
                "last_affected": "3.0.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "8e214d4461a62f78956607500d9417ddc2f451ef"
            },
            {
              "fixed": "5ccec9746faa28d79a87138042174c3853d5702b"
            },
            {
              "introduced": "3cef8e0d9557bbde60c3f1bfd2cbb1004af7fc9a"
            },
            {
              "fixed": "fbc5e9a1bda7e4556be21bb1d970f382760ed9a9"
            },
            {
              "fixed": "4c883fdb0f0e7ea577f851bd457024f7e88788c9"
            }
          ],
          "repo": "https://github.com/symfony/ux",
          "type": "GIT"
        }
      ],
      "versions": [
        "3.0.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-38x5-rcv4-xf7x"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49210.json"
  },
  "details": "Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, Symfony\\UX\\LiveComponent\\Util\\ChildComponentPartialRenderer::createHtml() interpolates the client-controlled children[id].tag value from LiveComponentSubscriber and InterceptChildComponentRenderSubscriber directly into HTML as a tag name without escaping or validation, allowing arbitrary HTML, including \u003cscript\u003e tags, on any Live Component re-render that contains at least one child component. This issue is fixed in versions 2.36.0 and 3.1.0.",
  "id": "CVE-2026-49210",
  "modified": "2026-08-12T03:51:13.091750469Z",
  "published": "2026-07-17T16:09:17.850Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/symfony/ux/releases/tag/v2.36.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/symfony/ux/releases/tag/v3.1.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49210.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/symfony/ux/security/advisories/GHSA-38x5-rcv4-xf7x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49210"
    },
    {
      "type": "FIX",
      "url": "https://github.com/symfony/ux/commit/fbc5e9a1bda7e4556be21bb1d970f382760ed9a9"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Symfony UX: XSS in symfony/ux-live-component via attacker-controlled child component tag"
}