{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "8.6.58"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ec2cce9e331459515ed1cdf051277117385673e2"
            }
          ],
          "repo": "https://github.com/parse-community/parse-server",
          "type": "GIT"
        },
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "9.0.0"
              },
              {
                "fixed": "9.6.0-alpha.52"
              }
            ]
          },
          "events": [
            {
              "introduced": "532a461d30a6ed4457839f2caf5f30d5abf51a55"
            },
            {
              "fixed": "cdd377617b607e24cdf96ef8176fa0e70a2dc435"
            }
          ],
          "repo": "https://github.com/parse-community/parse-server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g4cf-xj29-wqqr"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33538.json"
  },
  "details": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.58 and 9.6.0-alpha.52, an unauthenticated attacker can cause denial of service by sending authentication requests with arbitrary, unconfigured provider names. The server executes a database query for each unconfigured provider before rejecting the request, and since no database index exists for unconfigured providers, each request triggers a full collection scan on the user database. This can be parallelized to saturate database resources. This issue has been patched in versions 8.6.58 and 9.6.0-alpha.52.",
  "id": "CVE-2026-33538",
  "modified": "2026-04-01T23:09:56.838161441Z",
  "published": "2026-03-24T18:24:51.595Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33538.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357"
    },
    {
      "type": "FIX",
      "url": "https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54"
    },
    {
      "type": "FIX",
      "url": "https://github.com/parse-community/parse-server/pull/10270"
    },
    {
      "type": "FIX",
      "url": "https://github.com/parse-community/parse-server/pull/10271"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33538"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Parse Server: Denial of service via unindexed database query for unconfigured auth providers"
}