Improper Neutralization of Special Elements Used in a Template Engine in Kibana Workflows Leading to Server-Side Request Forgery (SSRF)

{
  "id": "0159965555373877be21bf4fe1e973d75155652bdb2b18bb5eee1163bc908313",
  "url": "https://osv.dev/vulnerability/CVE-2026-26938",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Improper Neutralization of Special Elements Used in a Template Engine in Kibana Workflows Leading to Server-Side Request Forgery (SSRF)",
    "summary": "Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336) exists in Workflows in Kibana which could allow an attacker to read arbitrary files from the Kibana server filesystem, and perform Server-Side Request Forgery (SSRF) via Code Injection (CAPEC-242). This requires an authenticated user who has the workflowsManagement:executeWorkflow privilege.",
    "evidence": "osv:CVE-2026-26938",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-26938",
      "aliases": [
        "BIT-elk-2026-26938",
        "BIT-kibana-2026-26938",
        "CVE-2026-26938"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/elastic/elasticsearch",
              "type": "GIT",
              "events": [
                {
                  "introduced": "17b451d8979a29e31935fe1eb901310350b30e62"
                },
                {
                  "last_affected": "17b451d8979a29e31935fe1eb901310350b30e62"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:elastic:kibana:9.3.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "9.3.0"
                      },
                      {
                        "last_affected": "9.3.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "9.3.0",
            "v9.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26938.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/elastic/kibana",
              "type": "GIT",
              "events": [
                {
                  "introduced": "30ab63cc0017fe2da7a84fb9b285dd762468802d"
                },
                {
                  "last_affected": "30ab63cc0017fe2da7a84fb9b285dd762468802d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:elastic:kibana:9.3.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "9.3.0"
                      },
                      {
                        "last_affected": "9.3.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "9.3.0",
            "v9.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26938.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.204631386Z",
      "provider": "osv",
      "references": [
        "https://discuss.elastic.co/t/kibana-9-3-1-security-update-esa-2026-17/385253",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26938.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-26938"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1336"
        ],
        "cna_assigner": "elastic",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.3.0"
                  },
                  {
                    "last_affected": "9.3.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandaloneSingleVersion"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26938.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-26938",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499267,
  "published_at": "2026-02-26T17:56:48.611+00:00"
}