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Critical

Security advisory

Type: advisorySources: OSVCVE: CVE-2018-20718

In Pydio before 8.2.2, an attack is possible via PHP Object Injection because a user is allowed to use the $phpserial$a:0:{} syntax to store a preference. An attacker either needs a "public link" of a file, or access to any unprivileged user account for creation of such a link.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2018-20718
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 08:18 UTC · Revision 1

Source evidence

CVE-2018-20718

core-osv · Original source

Published 15 Jan 2019, 16:29 UTC

In Pydio before 8.2.2, an attack is possible via PHP Object Injection because a user is allowed to use the $phpserial$a:0:{} syntax to store a preference. An attacker either needs a "public link" of a file, or access to any unprivileged user account for creation of such a link.

osv:CVE-2018-20718
Complete source record
{
  "id": "54a9797508d1021e39ca9f78cf6a5d8e9abaa4482198fe328d69510847e36f35",
  "url": "https://osv.dev/vulnerability/CVE-2018-20718",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-20718",
    "summary": "In Pydio before 8.2.2, an attack is possible via PHP Object Injection because a user is allowed to use the $phpserial$a:0:{} syntax to store a preference. An attacker either needs a \"public link\" of a file, or access to any unprivileged user account for creation of such a link.",
    "evidence": "osv:CVE-2018-20718",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2018-20718",
      "aliases": [
        "CVE-2018-20718"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pydio/pydio-core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "87499355dd8666e2885b9f558af4843fce4f82c0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:pydio:pydio:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "8.2.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "pydio-core-8.0.2",
            "pydio-core-7.0.4",
            "pydio-core-7.0.3",
            "pydio-core-7.0.2",
            "pydio-core-6.4.2",
            "pydio-core-6.4.2rc1",
            "pydio-core-6.4.1",
            "pydio-core-6.4.0",
            "pydio-core-6.4.0rc3",
            "pydio-core-6.4.0rc2",
            "pydio-core-6.4.0rc1",
            "pydio-core-6.2.2",
            "pydio-core-6.3.1",
            "pydio-core-6.2.2rc3",
            "pydio-core-6.2.2rc2",
            "pydio-core-6.2.2rc",
            "pydio-core-6.2.1",
            "pydio-core-6.2.0",
            "6.2rc",
            "pydio-core-6.0.8",
            "pydio-core-6.0.7",
            "pydio-core-5.2.5",
            "pydio-core-6.0.6",
            "pydio-core-6.0.5",
            "pydio-core-6.0.4",
            "pydio-core-6.0.3",
            "pydio-core-6.0.2",
            "pydio-core-6.0.1",
            "pydio-core-6.0.0",
            "pydio-core-5.2.4",
            "pydio-core-5.2.3",
            "pydio-core-5.2.2",
            "pydio-core-5.2.1",
            "pydio-core-5.2.0",
            "pydio-core-5.1.1",
            "pydio-core-5.1.0",
            "ajaxplorer-core-5.0.2",
            "ajaxplorer-core-5.0.1",
            "ajaxplorer-core-5.0.0",
            "ajaxplorer-core-4.3.4",
            "ajaxplorer-core-4.3.3",
            "ajaxplorer-core-4.3.2",
            "ajaxplorer-core-4.3.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20718.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:05.645603307Z",
      "provider": "osv",
      "references": [
        "https://blog.ripstech.com/2018/pydio-unauthenticated-remote-code-execution/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-20718",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 440806,
  "published_at": "2019-01-15T16:29:00.663+00:00"
}