{"id":"CVE-2026-85500","state":"PUBLISHED","title":"`require_confirmed_with` is not enforced on the action and fails open on an unreadable attribute in AshAuthentication","description":"Authentication Bypass by Primary Weakness vulnerability in team-alembic AshAuthentication allows an unconfirmed user to obtain a session, defeating a mandatory email confirmation requirement.\n\nAshAuthentication.Strategy.Password.Actions.check_user/2 decides whether the attribute named by require_confirmed_with is set using a bare is_nil(Map.get(user, value)). When that attribute is not selected on the loaded record Map.get/2 returns %Ash.NotLoaded{}, and when a field policy denies it for the current actor it returns %Ash.ForbiddenField{}. Neither is nil, so the rejection branch is skipped and sign-i\n\nrequire_confirmed_with is enforced in two places, and neither holds in every configuration. sign_in_with_token and register are checked only inside AshAuthentication.Strategy.Password.Actions, not on the action itself, so any caller that invokes the action directly skips the check. An API layer such as AshGraphql or AshJsonApi invokes the action directly, so this applies to the default configuration. Where a check does run it compares the confirmation attribute against nil. That attribute holds %Ash.NotLoaded{} or %Ash.ForbiddenField{} when it sets select_by_default?: false, when an API layer narrows the read's select, or when a field policy hides it from the sign-in actor. Neither struct is nil, so those configurations read every user as confirmed.\n\nThis issue affects ash_authentication: from 4.3.8 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.","publishedAt":"2026-09-17T13:09:43.000Z","updatedAt":"2026-09-17T18:12:54.127Z","severity":{"score":9.1,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","source":"EEF"},"assigner":"EEF","products":["team-alembic ash_authentication"],"affected":[{"vendor":"team-alembic","product":"ash_authentication","packageName":"ash_authentication","packageURL":"pkg:hex/ash_authentication","defaultStatus":"unaffected","versions":[{"version":"4.3.8","status":"affected","lessThan":"4.15.0","versionType":"semver"},{"version":"5.0.0-rc.0","status":"affected","lessThan":"5.0.0-rc.14","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Strategy.Password.Actions'"],"programFiles":["lib/ash_authentication/strategies/password/actions.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':check_user/2"},{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':sign_in_with_token/3"},{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':register/3"}],"repo":"https://github.com/team-alembic/ash_authentication"},{"vendor":"team-alembic","product":"ash_authentication","packageName":"team-alembic/ash_authentication","packageURL":"pkg:github/team-alembic/ash_authentication","defaultStatus":"unaffected","versions":[{"version":"7d37bc6e4df6697b5813d2f373f0fdb08f813f98","status":"affected","lessThan":"*","changes":[{"at":"17f4c25a372d1778c9cc457759e6357570d83711","status":"unaffected"},{"at":"1076639a9d40213088d110c79ba6735b8cc85b16","status":"unaffected"}],"versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Strategy.Password.Actions'"],"programFiles":["lib/ash_authentication/strategies/password/actions.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':check_user/2"},{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':sign_in_with_token/3"},{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':register/3"}],"repo":"https://github.com/team-alembic/ash_authentication"}],"references":["https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-fc47-6pgw-wh22","https://cna.erlef.org/cves/CVE-2026-85500.html","https://osv.dev/vulnerability/EEF-CVE-2026-85500","https://github.com/team-alembic/ash_authentication/commit/7d37bc6e4df6697b5813d2f373f0fdb08f813f98","https://github.com/team-alembic/ash_authentication/commit/17f4c25a372d1778c9cc457759e6357570d83711","https://github.com/team-alembic/ash_authentication/commit/1076639a9d40213088d110c79ba6735b8cc85b16"],"weaknesses":["CWE-305"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/85xxx/CVE-2026-85500.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-85500","state":"PUBLISHED","datePublished":"2026-09-17T13:09:43.000Z","dateUpdated":"2026-09-17T18:12:54.127Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-09-07T23:45:01.895Z"},"containers":{"cna":{"title":"`require_confirmed_with` is not enforced on the action and fails open on an unreadable attribute in AshAuthentication","descriptions":[{"lang":"en","value":"Authentication Bypass by Primary Weakness vulnerability in team-alembic AshAuthentication allows an unconfirmed user to obtain a session, defeating a mandatory email confirmation requirement.\n\nAshAuthentication.Strategy.Password.Actions.check_user/2 decides whether the attribute named by require_confirmed_with is set using a bare is_nil(Map.get(user, value)). When that attribute is not selected on the loaded record Map.get/2 returns %Ash.NotLoaded{}, and when a field policy denies it for the current actor it returns %Ash.ForbiddenField{}. Neither is nil, so the rejection branch is skipped and sign-i\n\nrequire_confirmed_with is enforced in two places, and neither holds in every configuration. sign_in_with_token and register are checked only inside AshAuthentication.Strategy.Password.Actions, not on the action itself, so any caller that invokes the action directly skips the check. An API layer such as AshGraphql or AshJsonApi invokes the action directly, so this applies to the default configuration. Where a check does run it compares the confirmation attribute against nil. That attribute holds %Ash.NotLoaded{} or %Ash.ForbiddenField{} when it sets select_by_default?: false, when an API layer narrows the read's select, or when a field policy hides it from the sign-in actor. Neither struct is nil, so those configurations read every user as confirmed.\n\nThis issue affects ash_authentication: from 4.3.8 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14."}],"affected":[{"vendor":"team-alembic","product":"ash_authentication","packageName":"ash_authentication","packageURL":"pkg:hex/ash_authentication","defaultStatus":"unaffected","versions":[{"version":"4.3.8","status":"affected","lessThan":"4.15.0","versionType":"semver"},{"version":"5.0.0-rc.0","status":"affected","lessThan":"5.0.0-rc.14","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Strategy.Password.Actions'"],"programFiles":["lib/ash_authentication/strategies/password/actions.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':check_user/2"},{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':sign_in_with_token/3"},{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':register/3"}],"repo":"https://github.com/team-alembic/ash_authentication"},{"vendor":"team-alembic","product":"ash_authentication","packageName":"team-alembic/ash_authentication","packageURL":"pkg:github/team-alembic/ash_authentication","defaultStatus":"unaffected","versions":[{"version":"7d37bc6e4df6697b5813d2f373f0fdb08f813f98","status":"affected","lessThan":"*","changes":[{"at":"17f4c25a372d1778c9cc457759e6357570d83711","status":"unaffected"},{"at":"1076639a9d40213088d110c79ba6735b8cc85b16","status":"unaffected"}],"versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Strategy.Password.Actions'"],"programFiles":["lib/ash_authentication/strategies/password/actions.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':check_user/2"},{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':sign_in_with_token/3"},{"name":"'Elixir.AshAuthentication.Strategy.Password.Actions':register/3"}],"repo":"https://github.com/team-alembic/ash_authentication"}],"references":[{"url":"https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-fc47-6pgw-wh22","tags":["vendor-advisory","related"]},{"url":"https://cna.erlef.org/cves/CVE-2026-85500.html","name":"EEF CNA record for CVE-2026-85500","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-85500","name":"OSV record EEF-CVE-2026-85500","tags":["related"]},{"url":"https://github.com/team-alembic/ash_authentication/commit/7d37bc6e4df6697b5813d2f373f0fdb08f813f98","name":"Introducing commit 7d37bc6 in team-alembic/ash_authentication","tags":["related"]},{"url":"https://github.com/team-alembic/ash_authentication/commit/17f4c25a372d1778c9cc457759e6357570d83711","name":"Fix commit 17f4c25 in team-alembic/ash_authentication","tags":["patch"]},{"url":"https://github.com/team-alembic/ash_authentication/commit/1076639a9d40213088d110c79ba6735b8cc85b16","name":"Fix commit 1076639 in 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Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-17T18:12:03.493938Z","id":"CVE-2026-85500","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-17T18:12:54.127Z"}}]}}}