{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "2026.1.0"
              },
              {
                "fixed": "2026.1.5"
              },
              {
                "introduced": "2026.4.0"
              },
              {
                "fixed": "2026.4.2"
              },
              {
                "introduced": "2026.5.0"
              },
              {
                "fixed": "2026.5.1"
              },
              {
                "introduced": "2026.6.0"
              },
              {
                "last_affected": "2026.6.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "322d3c0ac6a8f133b3f82875e9dbbe310f638c1b"
            },
            {
              "fixed": "c06899647d758493d95a5b301e573ffa3db1e878"
            },
            {
              "introduced": "fdd750d960e603415db62242eca3c30d68e366db"
            },
            {
              "fixed": "4bbdddfc6700ca23604242111d4fa0e00347af97"
            },
            {
              "introduced": "640840d818f4ee9375829ece0ef452923bb0c012"
            },
            {
              "fixed": "598586ccf2e046a25d4b54132e4e1feb47f24e98"
            },
            {
              "introduced": "06d03da34c4ed09ea59f917f045ba250d2b6320d"
            },
            {
              "fixed": "37969503f20369eb1712b7b88daedcfb4f63f5f1"
            },
            {
              "fixed": "4d46638041b5f3d1e1f7f6f6f19c1df3bd65a586"
            },
            {
              "fixed": "6457ab71f36a2d1440fe96af0a2593897844b023"
            },
            {
              "fixed": "7deb4b6963442569357b41e61febe37594e5e730"
            },
            {
              "fixed": "06d03da34c4ed09ea59f917f045ba250d2b6320d"
            }
          ],
          "repo": "https://github.com/discourse/discourse",
          "type": "GIT"
        }
      ],
      "versions": [
        "2026.6.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-22v7-6wgj-g9f7"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-200"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45780.json"
  },
  "details": "Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, EventSerializer could expose invited group names, sample invitees, and attendance statistics to users who could view the topic but were not entitled to view the private event invitee list. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.",
  "id": "CVE-2026-45780",
  "modified": "2026-07-16T03:31:08.875339318Z",
  "published": "2026-07-09T22:08:52.125Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.1.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.4.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.5.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.6.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45780.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-22v7-6wgj-g9f7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45780"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/37969503f20369eb1712b7b88daedcfb4f63f5f1"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/4d46638041b5f3d1e1f7f6f6f19c1df3bd65a586"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/6457ab71f36a2d1440fe96af0a2593897844b023"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/7deb4b6963442569357b41e61febe37594e5e730"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Discourse: Private event sample invitees are serialized to non-invited event viewers"
}