Grav Flex Objects - Server-Side Template Injection via Dynamic Titles

{
  "id": "89050850e6f9b429cf21cd6ef658fc0507554b80b7e0ed00091fb912e9a39ac3",
  "url": "https://osv.dev/vulnerability/CVE-2026-58655",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Grav Flex Objects - Server-Side Template Injection via Dynamic Titles",
    "summary": "The bundled Grav Flex Objects plugin (getgrav/grav-plugin-flex-objects) before 1.4.0 contains a stored server-side template injection vulnerability. When rendering dynamic collection or object titles, the plugin passes user-controlled frontmatter values (page.header.flex.collection.title or page.header.flex.object.title) to Twig's template_from_string(), causing them to be evaluated as Twig code rather than treated as text. This path bypasses Grav's Security::cleanDangerousTwig() sanitization. An attacker who can control the title frontmatter of a publicly reachable Flex Objects page can achieve arbitrary Twig execution and escalate to remote command execution via access to internal Grav services such as the scheduler.",
    "evidence": "osv:CVE-2026-58655",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-58655",
      "aliases": [
        "CVE-2026-58655",
        "GHSA-623v-m3c4-3pw8"
      ],
      "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:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/getgrav/grav",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "9b149307efc9fd0fb0865bd22c1d717b25c1f31e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.4.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.4.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.3.10",
            "1.3.9",
            "1.3.8",
            "1.3.7",
            "1.3.6",
            "1.3.5",
            "1.3.4",
            "1.3.3",
            "1.3.2",
            "1.3.1",
            "1.3.0",
            "1.2.4",
            "1.2.3",
            "1.2.2",
            "1.2.1",
            "1.2.0",
            "1.1.17",
            "1.1.9-rc.3",
            "1.1.9-rc.2",
            "1.1.9-rc.1",
            "1.1.0-rc.3",
            "1.1.0-rc.2",
            "1.1.0-rc.1",
            "1.1.0-beta.5",
            "1.1.0-beta.4",
            "1.1.0-beta.3",
            "1.1.0-beta.2",
            "1.1.0-beta.1",
            "0.9.19",
            "0.9.18",
            "0.9.17",
            "0.9.16",
            "0.9.15",
            "0.9.14",
            "0.9.13",
            "0.9.12",
            "0.9.11",
            "0.9.10",
            "0.9.9",
            "0.9.8",
            "0.9.7",
            "0.9.6",
            "0.9.5",
            "0.9.4",
            "0.9.3",
            "0.9.2",
            "0.9.0",
            "0.8.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58655.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.184280500Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58655.json",
        "https://github.com/getgrav/grav/security/advisories/GHSA-623v-m3c4-3pw8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-58655",
        "https://www.vulncheck.com/advisories/grav-flex-objects-server-side-template-injection-via-dynamic-titles"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-94"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58655.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-58655",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497270,
  "published_at": "2026-07-15T11:25:34.186+00:00"
}