{
  "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-2026-102631",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-102631",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-15T16:42:19.368Z",
    "updatedAt": "2026-10-16T20:16:49.275Z",
    "importedAt": "2026-10-24T01:57:50.502Z",
    "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": "authd: Account takeover via username fallback in identity matching after IdP email reassignment",
      "summary": "In authd before 0.7.1, the user identity matching in UpdateUser (internal/users/manager.go) resolves an incoming login by the broker-scoped provider ID, but falls back to matching the username when the provider ID does not belong to any known user, and does not reject a conflicting non-empty provider ID. If an identity provider reassigns an email address, which authd uses as the username, to a new account, the new account inherits the previous user's local UID and home directory on its next login. This allows the new user to access and modify files belonging to the previous user, including credentials such as SSH keys and cloud API tokens, and silently rebinds the local account record to the new identity. As a mitigation, administrators should lock or delete the previous user's local authd account when the corresponding IdP account is removed.",
      "affected": [
        {
          "vendor": "Canonical",
          "product": "authd",
          "packageName": "authd",
          "platforms": [
            "Linux"
          ],
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0.1",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "0.7.1"
            },
            {
              "version": "0.1",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "0.7.1~ubuntu24.04.1"
            },
            {
              "version": "0.1",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "0.7.1~ubuntu26.04"
            }
          ]
        }
      ]
    }
  }
}