{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-21865",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-21865",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-01-28T19:51:37.991Z",
    "updatedAt": "2026-01-28T20:10:06.915Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Discourse topic conversion permission vulnerability for moderators",
      "summary": "Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, site admin can temporarily revoke the moderation role from untrusted moderators or remove the moderator group from the \"personal message enabled groups\" site setting until the Discourse instance has been upgraded to a version that has been patched.",
      "affected": [
        {
          "vendor": "discourse",
          "product": "discourse",
          "versions": [
            {
              "version": "< 3.5.4",
              "status": "affected"
            },
            {
              "version": ">= 2025.11.0-latest, < 2025.11.2",
              "status": "affected"
            },
            {
              "version": ">= 2025.12.0-latest, < 2025.12.1",
              "status": "affected"
            },
            {
              "version": ">= 2026.1.0-latest, < 2026.1.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}