CVE-2026-86533
Deferred
Deferred - Pending Action
BaseFortify
Vulnerability report for CVE-2026-86533, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-17
Last updated on: 2026-09-18
Assigner: EEF
Description
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| team-alembic | ash_authentication | 4.9.1 |
| team-alembic | ash_authentication | 5.0.0-rc.0 |
| team-alembic | ash_authentication | fcaeb73f76f8f2e9aef8bf637690d2a20dd97596 |
| team-alembic | ash_authentication_phoenix | 2.10.0 |
| team-alembic | ash_authentication_phoenix | 3.0.0-rc.0 |
| team-alembic | ash_authentication_phoenix | a3253fb4fc7145aeb403537af1c24d3a8d51ffb1 |
| team-alembic | ash_authentication_phoenix | 0135217e34e621dac79ae3d9559aeee49304b0aa |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-613 | According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization." |
