eef-cve-2026-86533
CVSS 9.1 osv_hex
Description
## Summary Insufficient Session Expiration vulnerability in team-alembic AshAuthentication and AshAuthentication Phoenix allows a revoked session to remain fully authenticated. A 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. This 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.
Timeline
- Published
- unknown
- Last Modified
- unknown
CVSS Details
CVSS details not available.
Affected Products
No product information available.
Weaknesses (CWE)
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://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
- https://hex.pm/packages/ash_authentication
- https://hex.pm/packages/ash_authentication_phoenix
Linked Vulnerabilities
No linked vulnerabilities found.
{
"affected": [
{
"database_specific": {
"source": "https://cna.erlef.org/osv/EEF-CVE-2026-86533.json"
},
"package": {
"ecosystem": "Hex",
"name": "ash_authentication",
"purl": "pkg:hex/ash_authentication"
},
"ranges": [
{
"events": [
{
"introduced": "4.9.1"
},
{
"fixed": "4.15.0"
}
],
"type": "SEMVER"
},
{
"events": [
{
"introduced": "5.0.0-rc.0"
},
{
"fixed": "5.0.0-rc.14"
}
],
"type": "SEMVER"
}
],
"versions": [
"4.10.0",
"4.11.0",
"4.12.0",
"4.13.0",
"4.13.1",
"4.13.2",
"4.13.3",
"4.13.4",
"4.13.5",
"4.13.6",
"4.13.7",
"4.14.0",
"4.14.1",
"4.14.2",
"4.9.1",
"4.9.2",
"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-2026-86533.json"
},
"package": {
"ecosystem": "Hex",
"name": "ash_authentication_phoenix",
"purl": "pkg:hex/ash_authentication_phoenix"
},
"ranges": [
{
"events": [
{
"introduced": "2.10.0"
},
{
"fixed": "2.17.4"
}
],
"type": "SEMVER"
},
{
"events": [
{
"introduced": "3.0.0-rc.0"
},
{
"fixed": "3.0.0-rc.11"
}
],
"type": "SEMVER"
}
],
"versions": [
"2.10.0",
"2.10.1",
"2.10.2",
"2.10.3",
"2.10.4",
"2.10.5",
"2.11.0",
"2.12.0",
"2.12.1",
"2.12.2",
"2.13.0",
"2.13.1",
"2.14.0",
"2.14.1",
"2.15.0",
"2.16.0",
"2.17.0",
"2.17.1",
"2.17.2",
"2.17.3",
"3.0.0-rc.0",
"3.0.0-rc.1",
"3.0.0-rc.10",
"3.0.0-rc.2",
"3.0.0-rc.3",
"3.0.0-rc.4",
"3.0.0-rc.6",
"3.0.0-rc.7",
"3.0.0-rc.8",
"3.0.0-rc.9"
]
},
{
"database_specific": {
"source": "https://cna.erlef.org/osv/EEF-CVE-2026-86533.json"
},
"ranges": [
{
"events": [
{
"introduced": "fcaeb73f76f8f2e9aef8bf637690d2a20dd97596"
},
{
"fixed": "a3f49f758f013d2ff086dd9c5ef2d94e921711b4"
},
{
"fixed": "e28e911caa9728d76329afdb0fb26742ffe4eeef"
}
],
"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"
]
},
{
"database_specific": {
"source": "https://cna.erlef.org/osv/EEF-CVE-2026-86533.json"
},
"ranges": [
{
"events": [
{
"introduced": "a3253fb4fc7145aeb403537af1c24d3a8d51ffb1"
},
{
"introduced": "0135217e34e621dac79ae3d9559aeee49304b0aa"
},
{
"fixed": "f7ab005a2aac09707a25521653c94893d328cc52"
},
{
"fixed": "0135217e34e621dac79ae3d9559aeee49304b0aa"
}
],
"repo": "https://github.com/team-alembic/ash_authentication_phoenix",
"type": "GIT"
}
],
"versions": [
"v2.17.3",
"v3.0.0-rc.10",
"v2.17.2",
"v3.0.0-rc.9",
"v2.17.1",
"3.0.0-rc.8",
"2.17.0",
"v3.0.0-rc.7",
"v2.16.0",
"v3.0.0-rc.6",
"v3.0.0-rc.4",
"v3.0.0-rc.3",
"3.0.0-rc.3",
"v3.0.0-rc.1",
"v2.15.0",
"v3.0.0-rc.0",
"v2.14.1",
"v2.14.0",
"v2.13.1",
"v2.13.0",
"v2.12.2",
"v2.12.1",
"v2.12.0",
"v2.11.0",
"v2.10.5",
"v2.10.4",
"v2.10.3",
"v2.10.2",
"v2.10.1",
"v2.10.0"
]
}
],
"aliases": [
"CVE-2026-86533",
"GHSA-m6x4-4gvp-xwjr"
],
"credits": [
{
"name": "Peter Ullrich",
"type": "REPORTER"
},
{
"name": "Jonatan Männchen / EEF",
"type": "ANALYST"
},
{
"name": "James Harton",
"type": "REMEDIATION_DEVELOPER"
}
],
"database_specific": {
"capec_ids": [
"CAPEC-60"
],
"cpe_ids": [
"cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*",
"cpe:2.3:a:team-alembic:ash_authentication_phoenix:*:*:*:*:*:*:*:*"
],
"cwe_ids": [
"CWE-613"
]
},
"details": "## Summary\n\nInsufficient 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.",
"id": "EEF-CVE-2026-86533",
"modified": "2026-09-17T14:15:02.857426476Z",
"published": "2026-09-17T13:09:37.963Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/team-alembic/ash_authentication_phoenix/security/advisories/GHSA-m6x4-4gvp-xwjr"
},
{
"type": "WEB",
"url": "https://cna.erlef.org/cves/CVE-2026-86533.html"
},
{
"type": "ADVISORY",
"url": "https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-w374-hvrx-66hg"
},
{
"type": "WEB",
"url": "https://github.com/team-alembic/ash_authentication/commit/fcaeb73f76f8f2e9aef8bf637690d2a20dd97596"
},
{
"type": "FIX",
"url": "https://github.com/team-alembic/ash_authentication/commit/a3f49f758f013d2ff086dd9c5ef2d94e921711b4"
},
{
"type": "FIX",
"url": "https://github.com/team-alembic/ash_authentication/commit/e28e911caa9728d76329afdb0fb26742ffe4eeef"
},
{
"type": "WEB",
"url": "https://github.com/team-alembic/ash_authentication_phoenix/commit/a3253fb4fc7145aeb403537af1c24d3a8d51ffb1"
},
{
"type": "WEB",
"url": "https://github.com/team-alembic/ash_authentication_phoenix/commit/0135217e34e621dac79ae3d9559aeee49304b0aa"
},
{
"type": "FIX",
"url": "https://github.com/team-alembic/ash_authentication_phoenix/commit/f7ab005a2aac09707a25521653c94893d328cc52"
},
{
"type": "PACKAGE",
"url": "https://hex.pm/packages/ash_authentication"
},
{
"type": "PACKAGE",
"url": "https://hex.pm/packages/ash_authentication_phoenix"
}
],
"schema_version": "1.9.0",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Revoked session accepted because the session jti is never checked in AshAuthentication and AshAuthentication Phoenix"
}