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CVE

EEF-CVE-2026-86533

Revoked session accepted because the session jti is never checked in AshAuthentication and AshAuthentication Phoenix
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CVE

EEF-CVE-2026-86533

Revoked session accepted because the session jti is never checked in AshAuthentication and AshAuthentication Phoenix

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 requiretokenpresenceforauthentication? 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.authenticateresourcefrom_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.subjecttouser/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 ashauthentication: from 4.9.1 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14; ashauthentication_phoenix: from 2.10.0 before 2.17.4 and from 3.0.0-rc.0 before 3.0.0-rc.11.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/team-alembic/ashauthenticationphoenix/security/advisories/GHSA-m6x4-4gvp-xwjr, https://cna.erlef.org/cves/CVE-2026-86533.html, https://github.com/team-alembic/ashauthentication/security/advisories/GHSA-w374-hvrx-66hg, https://github.com/team-alembic/ashauthentication/commit/fcaeb73f76f8f2e9aef8bf637690d2a20dd97596, https://github.com/team-alembic/ashauthentication/commit/a3f49f758f013d2ff086dd9c5ef2d94e921711b4, https://github.com/team-alembic/ashauthentication/commit/e28e911caa9728d76329afdb0fb26742ffe4eeef, https://github.com/team-alembic/ashauthenticationphoenix/commit/a3253fb4fc7145aeb403537af1c24d3a8d51ffb1, https://github.com/team-alembic/ashauthenticationphoenix/commit/0135217e34e621dac79ae3d9559aeee49304b0aa, https://github.com/team-alembic/ashauthenticationphoenix/commit/f7ab005a2aac09707a25521653c94893d328cc52, https://hex.pm/packages/ashauthentication, https://hex.pm/packages/ashauthentication_phoenix

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00908%
EPSS Percentile
0.58816%
Introduced Version
4.9.1,5.0.0-rc.0,2.10.0,3.0.0-rc.0,fcaeb73f76f8f2e9aef8bf637690d2a20dd97596,a3253fb4fc7145aeb403537af1c24d3a8d51ffb1,0135217e34e621dac79ae3d9559aeee49304b0aa
Fix Available
4.15.0,5.0.0-rc.14,2.17.4,3.0.0-rc.11,e28e911caa9728d76329afdb0fb26742ffe4eeef,0135217e34e621dac79ae3d9559aeee49304b0aa

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