Documenso - Assistant Recipient Can Forge Another Signer's Signature in Sequential-Signing Documents

{
  "id": "34d1e4585bba0e5f677164ab104e52c79a443bf64b671fd2803a64f8b2ae50a4",
  "url": "https://osv.dev/vulnerability/CVE-2026-71247",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Documenso - Assistant Recipient Can Forge Another Signer's Signature in Sequential-Signing Documents",
    "summary": "Documenso's sign-field-with-token.ts, used by the live document-signing UI, allows a recipient with the ASSISTANT role to fetch and complete fields belonging to any later-or-equal-order, not-yet-signed recipient in the same envelope, with no restriction on field type. A newer V2 signing path (sign-envelope-field.ts) explicitly blocks assistants from completing SIGNATURE fields, and the project's own test suite comments confirm this guard is absent from the V1 path used here.",
    "evidence": "osv:CVE-2026-71247",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-71247",
      "aliases": [
        "CVE-2026-71247"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/documenso/documenso",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71247.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.346629105Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71247.json",
        "https://github.com/documenso/documenso",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-71247"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "TuranSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71247.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-71247",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496251,
  "published_at": "2026-08-05T10:56:59.954+00:00"
}