{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "7.2.0"
              },
              {
                "fixed": "7.4.13"
              },
              {
                "introduced": "8.0.0"
              },
              {
                "fixed": "8.0.13"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0d0ab4d491f22306c893b2d30ce73ea911201a61"
            },
            {
              "fixed": "da3c28025a664e6a88e1af104a74457d99301161"
            },
            {
              "introduced": "bea6dc79db4d95c34b77ec27273d812aa64d65be"
            },
            {
              "fixed": "ca895c1303cc1d290f190cd7301d48fcef9e73e5"
            }
          ],
          "repo": "https://github.com/symfony/security-http",
          "type": "GIT"
        },
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "7.2.0"
              },
              {
                "fixed": "7.4.13"
              },
              {
                "introduced": "8.0.0"
              },
              {
                "fixed": "8.0.13"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "df8cd437bf489cf5aebe7e01e61daad120321c3b"
            },
            {
              "fixed": "d9981b6e4c77b97472845a9b7fcba5507208aacc"
            },
            {
              "introduced": "2e913a829cfbbf9cb38b321bdff1806b44b192eb"
            },
            {
              "fixed": "ad82cb517407582bb697e079c5ee62bf8b7af3b7"
            },
            {
              "fixed": "bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88"
            }
          ],
          "repo": "https://github.com/symfony/symfony",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rrj9-5q2j-4gvr"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-347",
      "CWE-757"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48747.json"
  },
  "details": "Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.13 and 8.0.13, MailomatRequestParser::validateSignature() parsed X-MOM-Webhook-Signature as algo=signature and passed the request-selected algorithm to hash_hmac(), allowing a signature algorithm downgrade instead of enforcing Mailomat's documented SHA-256 webhook signature. This issue is fixed in versions 7.4.13 and 8.0.13.",
  "id": "CVE-2026-48747",
  "modified": "2026-08-12T03:51:44.323291011Z",
  "published": "2026-07-14T19:16:24.327Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/symfony/symfony/releases/tag/v7.4.13"
    },
    {
      "type": "WEB",
      "url": "https://github.com/symfony/symfony/releases/tag/v8.0.13"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48747.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48747"
    },
    {
      "type": "FIX",
      "url": "https://github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade"
}