FKIE_CVE-2026-68746

Vulnerability from fkie_nvd - Published: 2026-08-05 20:17 - Updated: 2026-08-10 16:47
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Not Failing Securely ('Failing Open') vulnerability in livebook-dev livebook allows an unauthenticated network client to obtain full access to a Livebook server that enforces identity through Livebook Teams. A Livebook Agent or App Server connected to Livebook Teams caches the identifier of the deployment group it belongs to, and resolves that identifier against a locally cached list of deployment groups on every request in order to decide whether Teams identity enforcement is active. Livebook.Hubs.TeamClient.handle_call/3 in lib/livebook/hubs/team_client.ex does not distinguish a deployment group that could not be resolved from one that was resolved with identity enforcement switched off: the clause matches only the case where a group was found with enforcement enabled, and falls through to a catch-all that reports enforcement as switched off for everything else. The two neighbouring functions that decide user and application access resolve the same identifier and treat the same unresolved result as a denial. When the identity status is reported as switched off, Livebook.ZTA.LivebookTeams.authenticate/3 in lib/livebook/zta/livebook_teams.ex returns empty identity metadata and allows the request to continue instead of halting it. LivebookWeb.UserPlug.build_current_user/3 merges that empty metadata into a newly built user, whose access type defaults to full access, and LivebookWeb.AuthPlug.authorized?/1 grants access to any user holding full access. The cached identifier becomes unresolvable when the deployment group it refers to is deleted while the agent is not connected to receive the change, most concretely when a deployment group is deleted during the window in which an agent is disconnected or reconnecting. The client removes the group from its cached list without clearing the identifier that refers to it. Any client able to reach the affected server over the network is then granted the same access as a fully privileged member of the organisation, including the ability to read notebooks and configured secrets, execute code on the server's runtime, and disrupt its operation. This issue affects livebook: from 0.19.7 before 0.19.9.
References
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://cna.erlef.org/cves/CVE-2026-68746.htmlVendor Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/livebook-dev/livebook/commit/2d3a2c710c880abd24a2bc888d3cf5239d98cf72Patch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/livebook-dev/livebook/commit/d374e90647edbb00286bfee9182c0161d29a8e07Patch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/livebook-dev/livebook/commit/d6d0dfa746b172540442852f74de4a9deacc433bPatch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/livebook-dev/livebook/security/advisories/GHSA-74j5-6grg-g6wjVendor Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://osv.dev/vulnerability/EEF-CVE-2026-68746Third Party Advisory
Impacted products
Vendor Product Version
livebook livebook *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "Elixir.Livebook.Hubs.TeamClient",
            "Elixir.Livebook.ZTA.LivebookTeams",
            "Elixir.LivebookWeb.AuthPlug"
          ],
          "packageName": "livebook",
          "packageURL": "pkg:hex/livebook",
          "product": "livebook",
          "programFiles": [
            "lib/livebook/hubs/team_client.ex",
            "lib/livebook/zta/livebook_teams.ex",
            "lib/livebook_web/plugs/auth_plug.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Livebook.Hubs.TeamClient\u0027:handle_call/3"
            },
            {
              "name": "\u0027Elixir.Livebook.Hubs.TeamClient\u0027:remove_deployment_group/2"
            },
            {
              "name": "\u0027Elixir.Livebook.Hubs.TeamClient\u0027:fetch_entry/3"
            },
            {
              "name": "\u0027Elixir.Livebook.ZTA.LivebookTeams\u0027:authenticate/3"
            },
            {
              "name": "\u0027Elixir.LivebookWeb.AuthPlug\u0027:authorized?/1"
            }
          ],
          "repo": "https://github.com/livebook-dev/livebook",
          "vendor": "livebook-dev",
          "versions": [
            {
              "lessThan": "0.19.9",
              "status": "affected",
              "version": "0.19.7",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://ghcr.io",
          "cpes": [
            "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "Elixir.Livebook.Hubs.TeamClient",
            "Elixir.Livebook.ZTA.LivebookTeams",
            "Elixir.LivebookWeb.AuthPlug"
          ],
          "packageName": "livebook-dev/livebook",
          "packageURL": "pkg:oci/livebook?repository_url=ghcr.io%2Flivebook-dev",
          "product": "livebook",
          "programFiles": [
            "lib/livebook/hubs/team_client.ex",
            "lib/livebook/zta/livebook_teams.ex",
            "lib/livebook_web/plugs/auth_plug.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Livebook.Hubs.TeamClient\u0027:handle_call/3"
            },
            {
              "name": "\u0027Elixir.Livebook.Hubs.TeamClient\u0027:remove_deployment_group/2"
            },
            {
              "name": "\u0027Elixir.Livebook.Hubs.TeamClient\u0027:fetch_entry/3"
            },
            {
              "name": "\u0027Elixir.Livebook.ZTA.LivebookTeams\u0027:authenticate/3"
            },
            {
              "name": "\u0027Elixir.LivebookWeb.AuthPlug\u0027:authorized?/1"
            }
          ],
          "vendor": "livebook-dev",
          "versions": [
            {
              "lessThan": "0.19.9",
              "status": "affected",
              "version": "0.19.7",
              "versionType": "other"
            },
            {
              "lessThan": "0.19.9-cuda12",
              "status": "affected",
              "version": "0.19.7-cuda12",
              "versionType": "other"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "Elixir.Livebook.Hubs.TeamClient",
            "Elixir.Livebook.ZTA.LivebookTeams",
            "Elixir.LivebookWeb.AuthPlug"
          ],
          "packageName": "livebook-dev/livebook",
          "packageURL": "pkg:github/livebook-dev/livebook",
          "product": "livebook",
          "programFiles": [
            "lib/livebook/hubs/team_client.ex",
            "lib/livebook/zta/livebook_teams.ex",
            "lib/livebook_web/plugs/auth_plug.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Livebook.Hubs.TeamClient\u0027:handle_call/3"
            },
            {
              "name": "\u0027Elixir.Livebook.Hubs.TeamClient\u0027:remove_deployment_group/2"
            },
            {
              "name": "\u0027Elixir.Livebook.Hubs.TeamClient\u0027:fetch_entry/3"
            },
            {
              "name": "\u0027Elixir.Livebook.ZTA.LivebookTeams\u0027:authenticate/3"
            },
            {
              "name": "\u0027Elixir.LivebookWeb.AuthPlug\u0027:authorized?/1"
            }
          ],
          "repo": "https://github.com/livebook-dev/livebook",
          "vendor": "livebook-dev",
          "versions": [
            {
              "changes": [
                {
                  "at": "d374e90647edbb00286bfee9182c0161d29a8e07",
                  "status": "unaffected"
                },
                {
                  "at": "d6d0dfa746b172540442852f74de4a9deacc433b",
                  "status": "unaffected"
                },
                {
                  "at": "2d3a2c710c880abd24a2bc888d3cf5239d98cf72",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "fc2c87c6b0276705281842acbe17142d1ac4d555",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:livebook:livebook:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "128456DE-5AA5-441B-8D70-3C9C2A42CB5D",
              "versionEndExcluding": "0.19.9",
              "versionStartIncluding": "0.19.7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Not Failing Securely (\u0027Failing Open\u0027) vulnerability in livebook-dev livebook allows an unauthenticated network client to obtain full access to a Livebook server that enforces identity through Livebook Teams.\n\nA Livebook Agent or App Server connected to Livebook Teams caches the identifier of the deployment group it belongs to, and resolves that identifier against a locally cached list of deployment groups on every request in order to decide whether Teams identity enforcement is active. Livebook.Hubs.TeamClient.handle_call/3 in lib/livebook/hubs/team_client.ex does not distinguish a deployment group that could not be resolved from one that was resolved with identity enforcement switched off: the clause matches only the case where a group was found with enforcement enabled, and falls through to a catch-all that reports enforcement as switched off for everything else. The two neighbouring functions that decide user and application access resolve the same identifier and treat the same unresolved result as a denial.\n\nWhen the identity status is reported as switched off, Livebook.ZTA.LivebookTeams.authenticate/3 in lib/livebook/zta/livebook_teams.ex returns empty identity metadata and allows the request to continue instead of halting it. LivebookWeb.UserPlug.build_current_user/3 merges that empty metadata into a newly built user, whose access type defaults to full access, and LivebookWeb.AuthPlug.authorized?/1 grants access to any user holding full access.\n\nThe cached identifier becomes unresolvable when the deployment group it refers to is deleted while the agent is not connected to receive the change, most concretely when a deployment group is deleted during the window in which an agent is disconnected or reconnecting. The client removes the group from its cached list without clearing the identifier that refers to it. Any client able to reach the affected server over the network is then granted the same access as a fully privileged member of the organisation, including the ability to read notebooks and configured secrets, execute code on the server\u0027s runtime, and disrupt its operation.\n\nThis issue affects livebook: from 0.19.7 before 0.19.9."
    }
  ],
  "id": "CVE-2026-68746",
  "lastModified": "2026-08-10T16:47:23.483",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "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",
          "privilegesRequired": "LOW",
          "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:L/UI:N/VC:H/VI:H/VA:H/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-68746",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-06T14:45:09.939122Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-05T20:17:14.393",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://cna.erlef.org/cves/CVE-2026-68746.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/livebook-dev/livebook/commit/2d3a2c710c880abd24a2bc888d3cf5239d98cf72"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/livebook-dev/livebook/commit/d374e90647edbb00286bfee9182c0161d29a8e07"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/livebook-dev/livebook/commit/d6d0dfa746b172540442852f74de4a9deacc433b"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
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      "url": "https://github.com/livebook-dev/livebook/security/advisories/GHSA-74j5-6grg-g6wj"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-68746"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-636"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}



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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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