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Critical

Froxlor before 2.3.12 Privilege Escalation via Symlink

Type: advisorySources: OSV

Froxlor is a server administration panel. In versions 2.3.10 and earlier, the customer data-export (DataDump) cron fails to validate intermediate path components of the export destination: Froxlor\FileDir::makeCorrectDir() contains an off-by-one in its path-component walk that skips the first segment below the customer home directory, and the guard in ExportCron.php checks only the final component with is_link(). An authenticated customer whose account has the export feature enabled can schedule an export into a genuine subdirectory of their own webspace, then replace an intermediate path component with a symlink before the root-owned cron runs. The cron's `chown -R` then recursively changes ownership of the linked directory tree — for example /etc — to the customer's UID, yielding host root and cross-tenant compromise. Exploitation is deterministic and requires no race. This is an incomplete fix of GHSA-75h4-... The issue is fixed in Froxlor 2.3.12.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-100716
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 18:26 UTC · Revision 1

Source evidence

Froxlor before 2.3.12 Privilege Escalation via Symlink

core-osv · Original source

Published 26 Sept 2026, 13:24 UTC

Froxlor is a server administration panel. In versions 2.3.10 and earlier, the customer data-export (DataDump) cron fails to validate intermediate path components of the export destination: Froxlor\FileDir::makeCorrectDir() contains an off-by-one in its path-component walk that skips the first segment below the customer home directory, and the guard in ExportCron.php checks only the final component with is_link(). An authenticated customer whose account has the export feature enabled can schedule an export into a genuine subdirectory of their own webspace, then replace an intermediate path component with a symlink before the root-owned cron runs. The cron's `chown -R` then recursively changes ownership of the linked directory tree — for example /etc — to the customer's UID, yielding host root and cross-tenant compromise. Exploitation is deterministic and requires no race. This is an incomplete fix of GHSA-75h4-... The issue is fixed in Froxlor 2.3.12.

osv:CVE-2026-100716
Complete source record
{
  "id": "f0afc968fa1215c081be85463452655f06daf98196b3612828d9e0985a5baf36",
  "url": "https://osv.dev/vulnerability/CVE-2026-100716",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Froxlor before 2.3.12 Privilege Escalation via Symlink",
    "summary": "Froxlor is a server administration panel. In versions 2.3.10 and earlier, the customer data-export (DataDump) cron fails to validate intermediate path components of the export destination: Froxlor\\FileDir::makeCorrectDir() contains an off-by-one in its path-component walk that skips the first segment below the customer home directory, and the guard in ExportCron.php checks only the final component with is_link(). An authenticated customer whose account has the export feature enabled can schedule an export into a genuine subdirectory of their own webspace, then replace an intermediate path component with a symlink before the root-owned cron runs. The cron's `chown -R` then recursively changes ownership of the linked directory tree — for example /etc — to the customer's UID, yielding host root and cross-tenant compromise. Exploitation is deterministic and requires no race. This is an incomplete fix of GHSA-75h4-... The issue is fixed in Froxlor 2.3.12.",
    "evidence": "osv:CVE-2026-100716",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-100716",
      "aliases": [
        "CVE-2026-100716",
        "GHSA-2wjc-6mgx-hq42"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/froxlor/froxlor",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "143b6ee634a4b9c237437b4b1206c7b733b86d95"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.3.12"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.3.10"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.3.11",
            "2.3.10",
            "2.3.9",
            "2.3.8",
            "2.3.7",
            "2.3.6",
            "2.3.5",
            "2.3.4",
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            "2.0.16",
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            "0.10.33",
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            "0.10.29.1",
            "0.10.29",
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            "0.10.23.1",
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            "0.10.17",
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            "0.10.15",
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            "0.10.13",
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            "0.10.0-rc2",
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            "0.9.39.5",
            "0.9.39.4",
            "0.9.39.3",
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            "0.9.39.1",
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            "0.9.38",
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            "0.9.33-rc2",
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            "0.9.28.1",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100716.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.444868310Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100716.json",
        "https://github.com/froxlor/froxlor/security/advisories/GHSA-2wjc-6mgx-hq42",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100716",
        "https://www.vulncheck.com/advisories/froxlor-before-2.3.12-privilege-escalation-via-symlink"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-59"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100716.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100716",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505682,
  "published_at": "2026-09-26T13:24:07.854+00:00"
}