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CVE-2026-86533 (GCVE-0-2026-86533)

Vulnerability from cvelistv5 – Published: 2026-09-17 13:09 – Updated: 2026-09-17 18:17
VLAI
Title
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 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.
Severity
9.1 (Critical)
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
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 18:13 UTC
CWE
  • CWE-613 - Insufficient Session Expiration
Assigner
References
Impacted products
Vendor Product Version CPE status
team-alembic ash_authentication Affected: 4.9.1 , < 4.15.0 (semver)
Affected: 5.0.0-rc.0 , < 5.0.0-rc.14 (semver)
    cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*
Create a notification for this product.
team-alembic ash_authentication Affected: fcaeb73f76f8f2e9aef8bf637690d2a20dd97596 , < * (git)
    cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*
Create a notification for this product.
team-alembic ash_authentication_phoenix Affected: 2.10.0 , < 2.17.4 (semver)
Affected: 3.0.0-rc.0 , < 3.0.0-rc.11 (semver)
    cpe:2.3:a:team-alembic:ash_authentication_phoenix:*:*:*:*:*:*:*:*
Create a notification for this product.
team-alembic ash_authentication_phoenix Affected: a3253fb4fc7145aeb403537af1c24d3a8d51ffb1 , < * (git)
Affected: 0135217e34e621dac79ae3d9559aeee49304b0aa , < * (git)
    cpe:2.3:a:team-alembic:ash_authentication_phoenix:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-17 13:09
Credits
Peter Ullrich Jonatan Männchen / EEF James Harton
Show details on NVD website
To clipboard 

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          "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 \u003cjti\u003e:\u003csubject\u003e. 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."
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            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
          }
        ],
        "cveTags": [],
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          {
            "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 \u003cjti\u003e:\u003csubject\u003e. 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."
          }
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        "id": "CVE-2026-86533",
        "lastModified": "2026-09-17T19:17:06.080",
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                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 9.1,
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                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
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                "valueDensity": "NOT_DEFINED",
                "vectorString": "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",
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                "vulnAvailabilityImpact": "NONE",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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        "published": "2026-09-17T14:17:46.467",
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        "vulnStatus": "Received",
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    "vulnrichment": {
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                  "value": "\u003cp\u003eInsufficient Session Expiration vulnerability in team-alembic AshAuthentication and AshAuthentication Phoenix allows a revoked session to remain fully authenticated.\u003c/p\u003e\n\u003cp\u003eA resource configured with \u003ccode\u003esession_identifier :jti\u003c/code\u003e and \u003ccode\u003erequire_token_presence_for_authentication?\u003c/code\u003e disabled stores its session value as \u003ccode\u003e\u0026lt;jti\u0026gt;:\u0026lt;subject\u0026gt;\u003c/code\u003e. The \u003ccode\u003ejti\u003c/code\u003e is there so that signing out can revoke that one session. Neither reader consults it: \u003ccode\u003eAshAuthentication.Plug.Helpers.authenticate_resource_from_session/4\u003c/code\u003e and \u003ccode\u003eAshAuthentication.Phoenix.LiveSession.on_mount/4\u003c/code\u003e both split the value with \u003ccode\u003esplit_identifier/2\u003c/code\u003e, discard the \u003ccode\u003ejti\u003c/code\u003e and pass the bare subject to \u003ccode\u003eAshAuthentication.subject_to_user/3\u003c/code\u003e, which reloads the record. The token-presence branch of each function does check its token, calling \u003ccode\u003eAshAuthentication.TokenResource.Actions.get_token/3\u003c/code\u003e with the \u003ccode\u003ejti\u003c/code\u003e and the purpose \u003ccode\u003euser\u003c/code\u003e. 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.\u003c/p\u003e\n\u003cp\u003eThis 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.\u003c/p\u003e"
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                  "type": "text/markdown",
                  "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 `\u003cjti\u003e:\u003csubject\u003e`. 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."
                }
              ],
              "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 \u003cjti\u003e:\u003csubject\u003e. 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."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-60",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-60 Reusing Session IDs (aka Session Replay)"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 9.1,
                "baseSeverity": "CRITICAL",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "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",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-613",
                  "description": "CWE-613 Insufficient Session Expiration",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-17T14:05:29.472Z",
            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory",
                "related"
              ],
              "url": "https://github.com/team-alembic/ash_authentication_phoenix/security/advisories/GHSA-m6x4-4gvp-xwjr"
            },
            {
              "name": "EEF CNA record for CVE-2026-86533",
              "tags": [
                "related"
              ],
              "url": "https://cna.erlef.org/cves/CVE-2026-86533.html"
            },
            {
              "name": "OSV record EEF-CVE-2026-86533",
              "tags": [
                "related"
              ],
              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-86533"
            },
            {
              "tags": [
                "related",
                "vendor-advisory"
              ],
              "url": "https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-w374-hvrx-66hg"
            },
            {
              "name": "Introducing commit fcaeb73 in team-alembic/ash_authentication",
              "tags": [
                "related"
              ],
              "url": "https://github.com/team-alembic/ash_authentication/commit/fcaeb73f76f8f2e9aef8bf637690d2a20dd97596"
            },
            {
              "name": "Fix commit a3f49f7 in team-alembic/ash_authentication",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/team-alembic/ash_authentication/commit/a3f49f758f013d2ff086dd9c5ef2d94e921711b4"
            },
            {
              "name": "Fix commit e28e911 in team-alembic/ash_authentication",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/team-alembic/ash_authentication/commit/e28e911caa9728d76329afdb0fb26742ffe4eeef"
            },
            {
              "name": "Introducing commit a3253fb in team-alembic/ash_authentication_phoenix",
              "tags": [
                "related"
              ],
              "url": "https://github.com/team-alembic/ash_authentication_phoenix/commit/a3253fb4fc7145aeb403537af1c24d3a8d51ffb1"
            },
            {
              "name": "Introducing commit 0135217 in team-alembic/ash_authentication_phoenix",
              "tags": [
                "related"
              ],
              "url": "https://github.com/team-alembic/ash_authentication_phoenix/commit/0135217e34e621dac79ae3d9559aeee49304b0aa"
            },
            {
              "name": "Fix commit f7ab005 in team-alembic/ash_authentication_phoenix",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/team-alembic/ash_authentication_phoenix/commit/f7ab005a2aac09707a25521653c94893d328cc52"
            }
          ],
          "source": {
            "discovery": "INTERNAL"
          },
          "title": "Revoked session accepted because the session jti is never checked in AshAuthentication and AshAuthentication Phoenix"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-86533",
        "datePublished": "2026-09-17T13:09:37.963Z",
        "dateReserved": "2026-09-11T18:00:02.036Z",
        "dateUpdated": "2026-09-17T18:17:21.199Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.