{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "3.4.0-alpha.0"
              },
              {
                "fixed": "3.4.5"
              }
            ]
          },
          "events": [
            {
              "introduced": "d106db0b3eb063073ffa8d5a9056645652077b5c"
            },
            {
              "fixed": "b7372aae0419ad3881e0792fd3c7dacd991bb90d"
            }
          ],
          "repo": "https://github.com/open-formulieren/open-forms",
          "type": "GIT"
        },
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.3.13"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "70ce5fae45b07d4625e7ae6b0a49c1498f23cd3e"
            }
          ],
          "repo": "https://github.com/open-formulieren/open-forms",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-2g49-rfm6-5qj5"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-284"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28803.json"
  },
  "details": "Open Forms allows users create and publish smart forms. Prior to 3.3.13 and 3.4.5, to be able to cosign, the cosigner receives an e-mail with instructions or a deep-link to start the cosign flow. The submission reference is communicated so that the user can retrieve the submission to be cosigned. Attackers can guess a code or modify the received code to look up arbitrary submissions, after logging in (with DigiD/eHerkenning/... depending on form configuration). This vulnerability is fixed in 3.3.13 and 3.4.5.",
  "id": "CVE-2026-28803",
  "modified": "2026-04-01T23:08:52.026098740Z",
  "published": "2026-03-11T15:52:08.464Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28803.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/open-formulieren/open-forms/security/advisories/GHSA-2g49-rfm6-5qj5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28803"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open Forms possible to view submission details of other people than intended"
}