{
  "affected": [
    {
      "database_specific": {
        "source": "https://cna.erlef.org/osv/EEF-CVE-2026-82685.json"
      },
      "package": {
        "ecosystem": "Hex",
        "name": "ash_authentication",
        "purl": "pkg:hex/ash_authentication"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.5.0"
            },
            {
              "fixed": "4.15.0"
            }
          ],
          "type": "SEMVER"
        },
        {
          "events": [
            {
              "introduced": "5.0.0-rc.0"
            },
            {
              "fixed": "5.0.0-rc.14"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": [
        "3.0.3",
        "3.1.0",
        "3.10.0",
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        "3.10.2",
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        "4.5.3",
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        "4.9.1",
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        "4.9.3",
        "4.9.4",
        "4.9.5",
        "4.9.6",
        "4.9.7",
        "4.9.8",
        "4.9.9",
        "5.0.0-rc.0",
        "5.0.0-rc.1",
        "5.0.0-rc.10",
        "5.0.0-rc.11",
        "5.0.0-rc.12",
        "5.0.0-rc.13",
        "5.0.0-rc.2",
        "5.0.0-rc.3",
        "5.0.0-rc.4",
        "5.0.0-rc.5",
        "5.0.0-rc.6",
        "5.0.0-rc.7",
        "5.0.0-rc.8",
        "5.0.0-rc.9"
      ]
    },
    {
      "database_specific": {
        "source": "https://cna.erlef.org/osv/EEF-CVE-2026-82685.json"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1d4bb00617aecae85c33f2ff5bc7e094c6449a6e"
            },
            {
              "fixed": "d7c15c21d39c009206e010cd67e2d86370fe7a28"
            },
            {
              "fixed": "2a2396af131ab67e2f445b805fecce8e6ca86c0e"
            }
          ],
          "repo": "https://github.com/team-alembic/ash_authentication",
          "type": "GIT"
        }
      ],
      "versions": [
        "v4.14.2",
        "v5.0.0-rc.13",
        "v4.14.1",
        "v5.0.0-rc.12",
        "v5.0.0-rc.11",
        "v5.0.0-rc.10",
        "v4.14.0",
        "v4.13.7",
        "5.0.0-rc.9",
        "5.0.0-rc.8",
        "v5.0.0-rc.7",
        "v5.0.0-rc.6",
        "v5.0.0-rc.5",
        "v5.0.0-rc.4",
        "v5.0.0-rc.3",
        "v5.0.0-rc.2",
        "v5.0.0-rc.1",
        "v5.0.0-rc.0",
        "v4.13.6",
        "v4.13.5",
        "v4.13.4",
        "v4.13.3",
        "v4.13.2",
        "v4.13.1",
        "v4.13.0",
        "v4.12.0",
        "v4.11.0",
        "v4.10.0",
        "v4.9.9",
        "v4.9.8",
        "v4.9.7",
        "v4.9.6",
        "v4.9.5",
        "v4.9.4",
        "v4.9.3",
        "v4.9.2",
        "v4.9.1",
        "v4.9.0",
        "v4.8.7",
        "v4.8.5",
        "v4.8.4",
        "v4.8.3",
        "v4.8.2",
        "v4.8.1",
        "v4.8.0",
        "v4.7.7",
        "v4.7.6",
        "v4.7.5",
        "v4.7.4",
        "v4.7.3",
        "v4.7.2",
        "v4.7.1",
        "v4.7.0",
        "v4.6.4",
        "v4.6.3",
        "v4.6.2",
        "v4.6.1",
        "v4.6.0",
        "v4.5.6",
        "v4.5.5",
        "v4.5.4",
        "v4.5.3",
        "v4.5.2",
        "v4.5.1",
        "v4.4.9",
        "v4.4.8",
        "v4.4.7",
        "v4.4.6",
        "v4.4.5",
        "v4.4.4",
        "v4.4.3",
        "v4.4.2",
        "v4.4.1",
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        "v4.1.0",
        "v4.0.4",
        "v4.0.3",
        "v4.0.2",
        "v4.0.1",
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        "v4.0.0-rc.7",
        "v4.0.0-rc.6",
        "v4.0.0-rc.5",
        "v4.0.0-rc.4",
        "v4.0.0-rc.3",
        "v4.0.0-rc.2",
        "v4.0.0-rc.1",
        "v4.0.0-rc.0",
        "v3.12.4",
        "v3.12.3",
        "v3.12.2",
        "v3.12.1",
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        "v3.11.16",
        "v3.11.15",
        "v3.11.14",
        "v3.11.13",
        "v3.11.12",
        "v3.11.10",
        "v3.11.9",
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        "v3.11.6",
        "v3.11.5",
        "v3.11.4",
        "v3.11.3",
        "v3.11.2",
        "v3.11.1",
        "v3.11.0",
        "v3.10.8",
        "v3.10.7",
        "v3.10.6",
        "v3.10.5",
        "v3.10.4",
        "v3.10.2",
        "v3.10.1",
        "v3.10.0",
        "v3.9.6",
        "v3.9.5",
        "v3.9.4",
        "v3.9.3",
        "v3.9.2",
        "v3.9.0",
        "v3.7.9",
        "v3.7.8",
        "v3.7.6",
        "v3.7.5",
        "v3.7.4",
        "v3.7.3",
        "v3.7.2",
        "v3.7.1",
        "v3.7.0",
        "v3.6.1",
        "v3.5.3",
        "v3.5.2",
        "v3.5.1",
        "v3.5.0",
        "v3.4.2",
        "v3.4.1",
        "v3.4.0",
        "v3.3.1",
        "v3.3.0",
        "v3.2.2",
        "v3.2.1",
        "v3.2.0",
        "v3.1.0",
        "v3.0.4",
        "v3.0.3",
        "v3.0.2",
        "v3.0.1",
        "v3.0.0",
        "v2.0.1",
        "v2.0.0",
        "v1.0.0",
        "v0.6.1",
        "v0.6.0",
        "v0.5.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-82685",
    "GHSA-g636-26vf-2w63"
  ],
  "credits": [
    {
      "name": "Peter Ullrich",
      "type": "REPORTER"
    },
    {
      "name": "James Harton",
      "type": "REMEDIATION_DEVELOPER"
    },
    {
      "name": "Jonatan Männchen / EEF",
      "type": "ANALYST"
    }
  ],
  "database_specific": {
    "capec_ids": [
      "CAPEC-21"
    ],
    "cpe_ids": [
      "cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"
    ],
    "cwe_ids": [
      "CWE-639"
    ]
  },
  "details": "## Summary\n\nAuthorization Bypass Through User-Controlled Key vulnerability in team-alembic AshAuthentication allows an authenticated attacker to overwrite and confirm another user's email address, and so take over that account. A confirmation token issued to one user is accepted on any other user's record.\n\n`AshAuthentication.AddOn.Confirmation.ConfirmChange` verifies the token's signature and its `act` claim, then applies the changes stored against that token to whichever record the changeset targets, never comparing the `sub` claim against `changeset.data`. An attacker who registers an account and changes their own email replays the resulting token against a victim's record id, writing in their own address with `force_change_attributes/2` and stamping `confirmed_at`, after which an ordinary password reset yields the account. The library's own confirmation flow is unaffected, because `AshAuthentication.AddOn.Confirmation.Actions.confirm/3` resolves `sub` to a user and targets that record.\n\nThis issue affects ash_authentication: from 0.5.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.",
  "id": "EEF-CVE-2026-82685",
  "modified": "2026-09-17T13:26:04.340611555Z",
  "published": "2026-09-17T13:08:56.491Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-g636-26vf-2w63"
    },
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-82685.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/team-alembic/ash_authentication/commit/1d4bb00617aecae85c33f2ff5bc7e094c6449a6e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/team-alembic/ash_authentication/commit/d7c15c21d39c009206e010cd67e2d86370fe7a28"
    },
    {
      "type": "FIX",
      "url": "https://github.com/team-alembic/ash_authentication/commit/2a2396af131ab67e2f445b805fecce8e6ca86c0e"
    },
    {
      "type": "PACKAGE",
      "url": "https://hex.pm/packages/ash_authentication"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Confirmation token accepted on any record in AshAuthentication"
}