Adminer before 6.0.2 Unauthenticated SSRF via Elasticsearch Driver

{
  "id": "1d8838a4d009c91786c0c7be509669f575f23bfee47cf0a6ec43484f9b42cbfb",
  "url": "https://osv.dev/vulnerability/CVE-2026-100696",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Adminer before 6.0.2 Unauthenticated SSRF via Elasticsearch Driver",
    "summary": "Adminer 4.16.0 through 6.0.1 contain a pre-authentication Server-Side Request Forgery (SSRF) vulnerability in the optional Elasticsearch driver (plugins/drivers/elastic.php), fixed in 6.0.2. Because adminer/include/auth.inc.php invokes Driver::connect() before the login result is validated, an unauthenticated attacker who submits crafted auth[server], auth[username], and auth[password] parameters can cause the Adminer server to issue an HTTP GET request (via get_url()/file_get_contents()) to an arbitrary reachable host and port. The driver validates only general server syntax and does not block loopback, private, link-local, or other reserved addresses; if no port is given it appends the default 9200, and Adminer's generic port check rejects ports below 1024. Selected JSON error fields from non-2xx Elasticsearch-style responses, as well as connection failures, are rendered on the login page, providing a port-scanning oracle and enabling internal network reconnaissance and service fingerprinting. Exploitation requires that the optional Elasticsearch driver be explicitly deployed (e.g., via the adminer/elastic.php template or an adminer_object() configuration; it is not loaded in a default build) and that PHP allow_url_fopen be enabled.",
    "evidence": "osv:CVE-2026-100696",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-100696",
      "aliases": [
        "CVE-2026-100696",
        "GHSA-q8h3-4cx4-prgm"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/vrana/adminer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "bac73e4a126f2e5e82d763da4e233e8ebff82055"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "6.0.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v6.0.1",
            "v6.0.0",
            "v5.5.1",
            "v5.5.0",
            "v5.4.4",
            "v5.4.3",
            "v5.4.2",
            "v5.4.1",
            "v5.4.0",
            "v5.3.0",
            "v5.2.1",
            "v5.2.0",
            "v5.1.1",
            "v5.1.0",
            "v5.0.6",
            "v5.0.5",
            "v5.0.4",
            "v5.0.3",
            "v5.0.2",
            "v5.0.1",
            "v5.0.0",
            "v4.17.1",
            "v4.17.0",
            "v4.16.0",
            "v4.8.1",
            "v4.8.0",
            "v4.7.9",
            "v4.7.8",
            "v4.7.7",
            "v4.7.5",
            "v4.7.4",
            "v4.7.3",
            "v4.7.2",
            "v4.7.1",
            "v4.7.0",
            "v4.6.3",
            "v4.6.2",
            "v4.6.1",
            "v4.6.0",
            "v4.5.0",
            "v4.4.0",
            "v4.3.1",
            "v4.3.0",
            "v4.2.5",
            "v4.2.4",
            "v4.2.3",
            "v4.2.2",
            "v4.2.1",
            "v4.2.0",
            "v4.1.0",
            "v4.0.3",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0",
            "v3.7.1",
            "v3.7.0",
            "v3.6.4",
            "v3.6.3",
            "v3.6.2",
            "v3.6.1",
            "v3.6.0",
            "v3.5.1",
            "v3.5.0",
            "v3.4.0",
            "v3.3.4",
            "v3.3.3",
            "v3.3.2",
            "v3.3.1",
            "v3.3.0",
            "v3.2.2",
            "v3.2.1",
            "v3.2.0",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100696.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.327570446Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100696.json",
        "https://github.com/vrana/adminer/security/advisories/GHSA-q8h3-4cx4-prgm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100696",
        "https://www.vulncheck.com/advisories/adminer-before-6.0.2-unauthenticated-ssrf-via-elasticsearch-driver"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100696.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100696",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494750,
  "published_at": "2026-09-26T13:23:53.613+00:00"
}