Wazuh cluster worker file sync allows arbitrary file write under /var/ossec (incomplete fix for CVE-2026-30893)

{
  "id": "e4f895484faf105308601c0dd8169d194937c09c504a3ae04f7274f8d5d6889b",
  "url": "https://osv.dev/vulnerability/CVE-2026-61800",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Wazuh cluster worker file sync allows arbitrary file write under /var/ossec (incomplete fix for CVE-2026-30893)",
    "summary": "Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. In versions 4.4.0 through 4.14.6, a party holding the cluster key can write, overwrite, or delete arbitrary files under /var/ossec on worker nodes, leading to remote code execution as root. During cluster file synchronization, the non-merged branch of update_master_files_in_worker() moves each staged file to a destination derived only from safe_join(), which confines the path to /var/ossec but never verifies that the file lands in the directory declared by its cluster_item_key. Because the destination check present on the primary node and on the worker's merged branch was not applied, a peer can place files at attacker-chosen locations under /var/ossec, including paths that are executed as root, and the delete branch has the same gap. This is an incomplete fix for CVE-2026-30893, which addressed traversal outside /var/ossec but left this path able to redirect files anywhere within it. This issue is fixed in version 4.14.7.",
    "evidence": "osv:CVE-2026-61800",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-61800",
      "aliases": [
        "CVE-2026-61800",
        "GHSA-3jff-488g-335f"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wazuh/wazuh",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2477e9fa50bc1424e834ac8401ce2450a5978e75"
                },
                {
                  "fixed": "a42268a27c555d9348d5598fb8751eaf4c8e9024"
                },
                {
                  "fixed": "f7f7c4d2d9e683c5d42e997fe7028a3fb2578853"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.4.0"
                      },
                      {
                        "fixed": "4.14.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f7f7c4d2d9e683c5d42e997fe7028a3fb2578853"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61800.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.149587446Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61800.json",
        "https://github.com/wazuh/wazuh/security/advisories/GHSA-3jff-488g-335f",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-61800",
        "https://github.com/wazuh/wazuh/commit/f7f7c4d2d9e683c5d42e997fe7028a3fb2578853"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61800.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-61800",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489460,
  "published_at": "2026-08-27T23:26:28.11+00:00"
}