{"id":"CVE-2026-86533","state":"PUBLISHED","title":"Revoked session accepted because the session jti is never checked in AshAuthentication and AshAuthentication Phoenix","description":"Insufficient Session Expiration vulnerability in team-alembic AshAuthentication and AshAuthentication Phoenix allows a revoked session to remain fully authenticated.\n\nA resource configured with session_identifier :jti and require_token_presence_for_authentication? disabled stores its session value as <jti>:<subject>. The jti is there so that signing out can revoke that one session. Neither reader consults it: AshAuthentication.Plug.Helpers.authenticate_resource_from_session/4 and AshAuthentication.Phoenix.LiveSession.on_mount/4 both split the value with split_identifier/2, discard the jti and pass the bare subject to AshAuthentication.subject_to_user/3, which reloads the record. The token-presence branch of each function does check its token, calling AshAuthentication.TokenResource.Actions.get_token/3 with the jti and the purpose user. Because the revocation record is never read, neither its revoked state nor its expiry constrains the session, so a session captured before sign-out keeps working.\n\nThis issue affects ash_authentication: from 4.9.1 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14; ash_authentication_phoenix: from 2.10.0 before 2.17.4 and from 3.0.0-rc.0 before 3.0.0-rc.11.","publishedAt":"2026-09-17T13:09:37.963Z","updatedAt":"2026-09-17T18:17:21.199Z","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","team-alembic ash_authentication_phoenix"],"affected":[{"vendor":"team-alembic","product":"ash_authentication","packageName":"ash_authentication","packageURL":"pkg:hex/ash_authentication","defaultStatus":"unaffected","versions":[{"version":"4.9.1","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.Plug.Helpers'"],"programFiles":["lib/ash_authentication/plug/helpers.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Plug.Helpers':retrieve_from_session/3"},{"name":"'Elixir.AshAuthentication.Plug.Helpers':authenticate_resource_from_session/4"}],"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":"fcaeb73f76f8f2e9aef8bf637690d2a20dd97596","status":"affected","lessThan":"*","changes":[{"at":"a3f49f758f013d2ff086dd9c5ef2d94e921711b4","status":"unaffected"},{"at":"e28e911caa9728d76329afdb0fb26742ffe4eeef","status":"unaffected"}],"versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Plug.Helpers'"],"programFiles":["lib/ash_authentication/plug/helpers.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Plug.Helpers':retrieve_from_session/3"},{"name":"'Elixir.AshAuthentication.Plug.Helpers':authenticate_resource_from_session/4"}],"repo":"https://github.com/team-alembic/ash_authentication"},{"vendor":"team-alembic","product":"ash_authentication_phoenix","packageName":"ash_authentication_phoenix","packageURL":"pkg:hex/ash_authentication_phoenix","defaultStatus":"unaffected","versions":[{"version":"2.10.0","status":"affected","lessThan":"2.17.4","versionType":"semver"},{"version":"3.0.0-rc.0","status":"affected","lessThan":"3.0.0-rc.11","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:team-alembic:ash_authentication_phoenix:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Phoenix.LiveSession'"],"programFiles":["lib/ash_authentication_phoenix/live_session.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Phoenix.LiveSession':on_mount/4"}],"repo":"https://github.com/team-alembic/ash_authentication_phoenix"},{"vendor":"team-alembic","product":"ash_authentication_phoenix","packageName":"team-alembic/ash_authentication_phoenix","packageURL":"pkg:github/team-alembic/ash_authentication_phoenix","defaultStatus":"unaffected","versions":[{"version":"a3253fb4fc7145aeb403537af1c24d3a8d51ffb1","status":"affected","lessThan":"*","changes":[{"at":"f7ab005a2aac09707a25521653c94893d328cc52","status":"unaffected"},{"at":"0135217e34e621dac79ae3d9559aeee49304b0aa","status":"unaffected"}],"versionType":"git"},{"version":"0135217e34e621dac79ae3d9559aeee49304b0aa","status":"affected","lessThan":"*","changes":[{"at":"f7ab005a2aac09707a25521653c94893d328cc52","status":"unaffected"},{"at":"0135217e34e621dac79ae3d9559aeee49304b0aa","status":"unaffected"}],"versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:team-alembic:ash_authentication_phoenix:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Phoenix.LiveSession'"],"programFiles":["lib/ash_authentication_phoenix/live_session.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Phoenix.LiveSession':on_mount/4"}],"repo":"https://github.com/team-alembic/ash_authentication_phoenix"}],"references":["https://github.com/team-alembic/ash_authentication_phoenix/security/advisories/GHSA-m6x4-4gvp-xwjr","https://cna.erlef.org/cves/CVE-2026-86533.html","https://osv.dev/vulnerability/EEF-CVE-2026-86533","https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-w374-hvrx-66hg","https://github.com/team-alembic/ash_authentication/commit/fcaeb73f76f8f2e9aef8bf637690d2a20dd97596","https://github.com/team-alembic/ash_authentication/commit/a3f49f758f013d2ff086dd9c5ef2d94e921711b4","https://github.com/team-alembic/ash_authentication/commit/e28e911caa9728d76329afdb0fb26742ffe4eeef","https://github.com/team-alembic/ash_authentication_phoenix/commit/a3253fb4fc7145aeb403537af1c24d3a8d51ffb1","https://github.com/team-alembic/ash_authentication_phoenix/commit/0135217e34e621dac79ae3d9559aeee49304b0aa","https://github.com/team-alembic/ash_authentication_phoenix/commit/f7ab005a2aac09707a25521653c94893d328cc52"],"weaknesses":["CWE-613"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/86xxx/CVE-2026-86533.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-86533","state":"PUBLISHED","datePublished":"2026-09-17T13:09:37.963Z","dateUpdated":"2026-09-17T18:17:21.199Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-09-11T18:00:02.036Z"},"containers":{"cna":{"title":"Revoked session accepted because the session jti is never checked in AshAuthentication and AshAuthentication Phoenix","descriptions":[{"lang":"en","value":"Insufficient Session Expiration vulnerability in team-alembic AshAuthentication and AshAuthentication Phoenix allows a revoked session to remain fully authenticated.\n\nA resource configured with session_identifier :jti and require_token_presence_for_authentication? disabled stores its session value as <jti>:<subject>. The jti is there so that signing out can revoke that one session. Neither reader consults it: AshAuthentication.Plug.Helpers.authenticate_resource_from_session/4 and AshAuthentication.Phoenix.LiveSession.on_mount/4 both split the value with split_identifier/2, discard the jti and pass the bare subject to AshAuthentication.subject_to_user/3, which reloads the record. The token-presence branch of each function does check its token, calling AshAuthentication.TokenResource.Actions.get_token/3 with the jti and the purpose user. Because the revocation record is never read, neither its revoked state nor its expiry constrains the session, so a session captured before sign-out keeps working.\n\nThis issue affects ash_authentication: from 4.9.1 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14; ash_authentication_phoenix: from 2.10.0 before 2.17.4 and from 3.0.0-rc.0 before 3.0.0-rc.11."}],"affected":[{"vendor":"team-alembic","product":"ash_authentication","packageName":"ash_authentication","packageURL":"pkg:hex/ash_authentication","defaultStatus":"unaffected","versions":[{"version":"4.9.1","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.Plug.Helpers'"],"programFiles":["lib/ash_authentication/plug/helpers.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Plug.Helpers':retrieve_from_session/3"},{"name":"'Elixir.AshAuthentication.Plug.Helpers':authenticate_resource_from_session/4"}],"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":"fcaeb73f76f8f2e9aef8bf637690d2a20dd97596","status":"affected","lessThan":"*","changes":[{"at":"a3f49f758f013d2ff086dd9c5ef2d94e921711b4","status":"unaffected"},{"at":"e28e911caa9728d76329afdb0fb26742ffe4eeef","status":"unaffected"}],"versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Plug.Helpers'"],"programFiles":["lib/ash_authentication/plug/helpers.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Plug.Helpers':retrieve_from_session/3"},{"name":"'Elixir.AshAuthentication.Plug.Helpers':authenticate_resource_from_session/4"}],"repo":"https://github.com/team-alembic/ash_authentication"},{"vendor":"team-alembic","product":"ash_authentication_phoenix","packageName":"ash_authentication_phoenix","packageURL":"pkg:hex/ash_authentication_phoenix","defaultStatus":"unaffected","versions":[{"version":"2.10.0","status":"affected","lessThan":"2.17.4","versionType":"semver"},{"version":"3.0.0-rc.0","status":"affected","lessThan":"3.0.0-rc.11","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:team-alembic:ash_authentication_phoenix:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Phoenix.LiveSession'"],"programFiles":["lib/ash_authentication_phoenix/live_session.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Phoenix.LiveSession':on_mount/4"}],"repo":"https://github.com/team-alembic/ash_authentication_phoenix"},{"vendor":"team-alembic","product":"ash_authentication_phoenix","packageName":"team-alembic/ash_authentication_phoenix","packageURL":"pkg:github/team-alembic/ash_authentication_phoenix","defaultStatus":"unaffected","versions":[{"version":"a3253fb4fc7145aeb403537af1c24d3a8d51ffb1","status":"affected","lessThan":"*","changes":[{"at":"f7ab005a2aac09707a25521653c94893d328cc52","status":"unaffected"},{"at":"0135217e34e621dac79ae3d9559aeee49304b0aa","status":"unaffected"}],"versionType":"git"},{"version":"0135217e34e621dac79ae3d9559aeee49304b0aa","status":"affected","lessThan":"*","changes":[{"at":"f7ab005a2aac09707a25521653c94893d328cc52","status":"unaffected"},{"at":"0135217e34e621dac79ae3d9559aeee49304b0aa","status":"unaffected"}],"versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:team-alembic:ash_authentication_phoenix:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAuthentication.Phoenix.LiveSession'"],"programFiles":["lib/ash_authentication_phoenix/live_session.ex"],"programRoutines":[{"name":"'Elixir.AshAuthentication.Phoenix.LiveSession':on_mount/4"}],"repo":"https://github.com/team-alembic/ash_authentication_phoenix"}],"references":[{"url":"https://github.com/team-alembic/ash_authentication_phoenix/security/advisories/GHSA-m6x4-4gvp-xwjr","tags":["vendor-advisory","related"]},{"url":"https://cna.erlef.org/cves/CVE-2026-86533.html","name":"EEF CNA record for CVE-2026-86533","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-86533","name":"OSV record EEF-CVE-2026-86533","tags":["related"]},{"url":"https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-w374-hvrx-66hg","tags":["related","vendor-advisory"]},{"url":"https://github.com/team-alembic/ash_authentication/commit/fcaeb73f76f8f2e9aef8bf637690d2a20dd97596","name":"Introducing commit fcaeb73 in team-alembic/ash_authentication","tags":["related"]},{"url":"https://github.com/team-alembic/ash_authentication/commit/a3f49f758f013d2ff086dd9c5ef2d94e921711b4","name":"Fix commit a3f49f7 in team-alembic/ash_authentication","tags":["patch"]},{"url":"https://github.com/team-alembic/ash_authentication/commit/e28e911caa9728d76329afdb0fb26742ffe4eeef","name":"Fix commit e28e911 in 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Ullrich"},{"lang":"en","type":"analyst","value":"Jonatan Männchen / EEF"},{"lang":"en","type":"remediation developer","value":"James Harton"}],"dateAssigned":"2026-09-11T18:52:39.000Z","datePublic":"2026-09-17T13:09:38.000Z","impacts":[{"capecId":"CAPEC-60","descriptions":[{"lang":"en","value":"CAPEC-60 Reusing Session IDs (aka Session Replay)"}]}],"source":{"discovery":"INTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-17T18:13:50.422619Z","id":"CVE-2026-86533","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":"2026-09-17T18:17:21.199Z"}}]}}}