{
  "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-2026-12249",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-12249",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-06-22T15:43:33.890Z",
    "updatedAt": "2026-06-22T17:30:57.314Z",
    "importedAt": "2026-10-24T01:57:55.771Z",
    "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": "Canonical ADSys Trust Store Poisoning via Plaintext HTTP Certificate Auto-Enrollment",
      "summary": "An issue was discovered in Canonical ADSys upstream versions through v0.16.2. During Active Directory Certificate Services (AD CS) certificate auto-enrollment via the vendored Samba client script (internal/policies/certificate/python/vendor_samba/gp/gp_cert_auto_enroll_ext.py), ADSys utilizes a plaintext HTTP connection (http://) instead of a secure HTTPS connection (https://) to request the CA certificate from the Active Directory Certificate Services server (GetCACert). An unauthenticated network attacker positioned between the managed Ubuntu host and the configured AD CS CA hostname can conduct a Man-in-the-Middle (MITM) attack. By intercepting the plaintext HTTP request, the attacker can supply an arbitrary, attacker-controlled Root CA certificate. Because the system automatically accepts this certificate and registers it into the local system trust store via update-ca-certificates, this results in system-wide trust store poisoning. Consequently, TLS clients utilizing the operating system trust store on the affected machine will accept rogue certificates for arbitrary domains, enabling persistent decryption and interception of subsequent TLS connections. This issue is resolved in version v0.16.3.",
      "affected": [
        {
          "packageName": "adsys",
          "collectionURL": "https://github.com/ubuntu",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0.13.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "0.16.3"
            }
          ]
        },
        {
          "vendor": "Canonical",
          "product": "Ubuntu 20.04 LTS",
          "packageName": "adsys",
          "collectionURL": "https://launchpad.net/ubuntu/focal",
          "platforms": [
            "Linux"
          ],
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0.9.2~20.04.2ubuntu0.1+esm2",
              "status": "unaffected",
              "versionType": "dpkg"
            }
          ]
        },
        {
          "vendor": "Canonical",
          "product": "Ubuntu 22.04 LTS",
          "packageName": "adsys",
          "collectionURL": "https://launchpad.net/ubuntu/jammy",
          "platforms": [
            "Linux"
          ],
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "0.16.3~22.04.2ubuntu0.22.04.1",
              "status": "unaffected",
              "versionType": "dpkg"
            }
          ]
        },
        {
          "vendor": "Canonical",
          "product": "Ubuntu 24.04 LTS",
          "packageName": "adsys",
          "collectionURL": "https://launchpad.net/ubuntu/noble",
          "platforms": [
            "Linux"
          ],
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "0.16.3~24.04.2ubuntu0.24.04.1",
              "status": "unaffected",
              "versionType": "dpkg"
            }
          ]
        },
        {
          "vendor": "Canonical",
          "product": "Ubuntu 25.10",
          "packageName": "adsys",
          "collectionURL": "https://launchpad.net/ubuntu/questing",
          "platforms": [
            "Linux"
          ],
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0.16.3",
              "status": "unaffected",
              "versionType": "dpkg"
            }
          ]
        },
        {
          "vendor": "Canonical",
          "product": "Ubuntu 26.04 LTS",
          "packageName": "adsys",
          "collectionURL": "https://launchpad.net/ubuntu/resolute",
          "platforms": [
            "Linux"
          ],
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0.16.4ubuntu1",
              "status": "unaffected",
              "versionType": "dpkg"
            }
          ]
        }
      ]
    }
  }
}