Stored XSS in Prospero Flow CRM email body allows administrator account takeover

{
  "id": "5b3698b227c4aa7ebcf07301e9c3fc4f802d11707e9885c23fab05caf788c901",
  "url": "https://osv.dev/vulnerability/CVE-2026-59239",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Stored XSS in Prospero Flow CRM email body allows administrator account takeover",
    "summary": "Stored Cross-site Scripting (CWE-79) in the email module in Roskus Prospero Flow CRM before 5.4.4 allows a remote, authenticated low-privileged user to execute arbitrary JavaScript in another user's browser, including administrators, leading to session compromise and account takeover, via a payload stored in an email body that is persisted without sanitization and rendered unescaped with {!! $email->body !!} when the recipient opens the message.",
    "evidence": "osv:CVE-2026-59239",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-59239",
      "aliases": [
        "CVE-2026-59239"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/roskus/prospero-flow-crm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "32efcd5c395ee55119fb9aea502a9d06e4c5adb8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "32efcd5c395ee55119fb9aea502a9d06e4c5adb8"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.6.0",
            "v2.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59239.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.233421474Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59239.json",
        "https://github.com/Roskus/prospero-flow-crm/releases",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-59239",
        "https://github.com/Roskus/prospero-flow-crm/commit/32efcd5c395ee55119fb9aea502a9d06e4c5adb8",
        "https://github.com/Roskus/prospero-flow-crm",
        "https://secur0.com/en/cna/cve-list/cve-2026-59239-stored-xss-in-prospero-flow-crm-email-body-allows-administrator-account-takeover"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "Secur0",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "1.0.0"
                  },
                  {
                    "fixed": "5.4.4"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "1.0.0"
                  },
                  {
                    "fixed": "5.4.4"
                  }
                ],
                "source": "CPE_FIELD",
                "strategy": "CPEApplicability"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "5.4.4"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59239.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-59239",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497306,
  "published_at": "2026-07-27T17:56:08.882+00:00"
}