{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.8.214"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "b3d7611e6e173ed8a5e525b791deb6b32cf1ce62"
            },
            {
              "fixed": "abf82ecc3ea85d53b319d27d3109560ff74d1173"
            }
          ],
          "repo": "https://github.com/freescout-help-desk/freescout",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-wjw4-8xg6-342m"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40590.json"
  },
  "details": "FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the Change Customer modal exposes a “Create a new customer” flow via POST /customers/ajax with action=create. Under limited visibility, the endpoint drops unique-email validation. If the supplied email already belongs to a hidden customer, Customer::create() reuses that hidden customer object and fills empty profile fields from attacker-controlled input. Version 1.8.214 fixes the vulnerability.",
  "id": "CVE-2026-40590",
  "modified": "2026-08-12T03:51:40.586905218Z",
  "published": "2026-04-21T16:52:27.992Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40590.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-wjw4-8xg6-342m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40590"
    },
    {
      "type": "FIX",
      "url": "https://github.com/freescout-help-desk/freescout/commit/b3d7611e6e173ed8a5e525b791deb6b32cf1ce62"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "FreeScout's Customer AJAX Create Modifies Hidden Existing Customer"
}