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CVE-2026-66885

Full vulnerability record from the local CVENow database.

Description

Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity. When Livebook is configured to use Livebook Teams for identity, Livebook.ZTA.LivebookTeams.handle_request/4 in lib/livebook/zta/livebook_teams.ex handles the OAuth-style callback carrying a teams_identity marker and a code parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No state or nonce is generated when the flow is initiated: Livebook.Teams.Requests.create_auth_request/1 in lib/livebook/teams/requests.ex sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against. An attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim. The consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility. This issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9.

Severity
MEDIUM
CVSS score
6.8 (v4.0)
Vulnerability status
Analyzed
Source identifier
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Published
2026-08-05 20:17:13.007000
Last modified
2026-10-24 16:10:00.153000
View original CVE JSON 
{
  "id": "CVE-2026-66885",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-08-05T20:17:13.007",
  "lastModified": "2026-10-24T16:10:00.153",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity.\n\nWhen Livebook is configured to use Livebook Teams for identity, Livebook.ZTA.LivebookTeams.handle_request/4 in lib/livebook/zta/livebook_teams.ex handles the OAuth-style callback carrying a teams_identity marker and a code parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No state or nonce is generated when the flow is initiated: Livebook.Teams.Requests.create_auth_request/1 in lib/livebook/teams/requests.ex sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against.\n\nAn attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim.\n\nThe consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility.\n\nThis issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de falsificación de petición en sitios cruzados (CSRF) en livebook-dev livebook permite a un atacante autenticar la sesión del navegador de una víctima bajo la propia identidad de Livebook Teams del atacante.\n\nCuando Livebook está configurado para usar Livebook Teams para la identidad, Livebook.ZTA.LivebookTeams.handle_request/4 en lib/livebook/zta/livebook_teams.ex maneja la devolución de llamada de estilo OAuth que lleva un marcador teams_identity y un parámetro code. La cláusula intercambia ese código por un token de acceso y escribe el token en la sesión del navegador sin verificar ningún valor que vincule la devolución de llamada a la sesión del navegador que inició el inicio de sesión. No se genera ningún estado o nonce cuando se inicia el flujo: Livebook.Teams.Requests.create_auth_request/1 en lib/livebook/teams/requests.ex envía un cuerpo de solicitud vacío, por lo que nunca se registra ningún valor por intento, y la cláusula de devolución de llamada no tiene nada con qué comparar.\n\nUn atacante que tiene membresía en la misma organización de Livebook Teams que la instancia objetivo puede, por lo tanto, iniciar el flujo de inicio de sesión ellos mismos, retener el código de autorización resultante sin canjearlo, e inducir a una víctima a abrir una URL manipulada que contenga ese código. El navegador de la víctima completa el intercambio y la sesión resultante se vincula a la identidad del atacante en lugar de la víctima. No se requiere que la víctima tenga ningún privilegio particular, y no se involucra ninguna credencial perteneciente a la víctima. La vulnerabilidad no permite al atacante autenticarse como la víctima.\n\nLa consecuencia es que un usuario cree que está trabajando en su propia sesión autenticada mientras que en realidad está operando como otra identidad. El trabajo realizado en esa sesión se atribuye a la cuenta del atacante, y los secretos, los datos cargados o los resultados del cuaderno que produce la víctima se exponen al atacante en lugar de mantenerse en la propia cuenta de la víctima. El código de autorización debe canjearse dentro de un corto período después de que comience el flujo de inicio de sesión, lo que restringe el momento del ataque pero no su viabilidad.\n\nEste problema afecta a livebook: desde 0.15.0 antes de 0.18.7 y desde 0.19.0 antes de 0.19.9."
    }
  ],
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "vendor": "livebook-dev",
          "product": "livebook",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.hex.pm",
          "packageName": "livebook",
          "cpes": [
            "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "Elixir.Livebook.ZTA.LivebookTeams",
            "Elixir.Livebook.Teams.Requests"
          ],
          "programFiles": [
            "lib/livebook/zta/livebook_teams.ex",
            "lib/livebook/teams/requests.ex"
          ],
          "programRoutines": [
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            },
            {
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            }
          ],
          "repo": "https://github.com/livebook-dev/livebook",
          "packageURL": "pkg:hex/livebook",
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              "versionType": "semver",
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            },
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              "versionType": "semver",
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            }
          ]
        },
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          "modules": [
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          ],
          "programFiles": [
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            "lib/livebook/teams/requests.ex"
          ],
          "programRoutines": [
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            },
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            }
          ],
          "packageURL": "pkg:oci/livebook?repository_url=ghcr.io%2Flivebook-dev",
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            },
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              "status": "affected"
            },
            {
              "version": "0.15.0-cuda12",
              "lessThan": "0.18.7-cuda12",
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              "status": "affected"
            },
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              "version": "0.19.0-cuda12",
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            }
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        },
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          ],
          "modules": [
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            "Elixir.Livebook.Teams.Requests"
          ],
          "programFiles": [
            "lib/livebook/zta/livebook_teams.ex",
            "lib/livebook/teams/requests.ex"
          ],
          "programRoutines": [
            {
              "name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"
            },
            {
              "name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"
            }
          ],
          "repo": "https://github.com/livebook-dev/livebook",
          "packageURL": "pkg:github/livebook-dev/livebook",
          "versions": [
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              "version": "4380a411920531223088267ed1c0ad21f96ef660",
              "lessThan": "*",
              "versionType": "git",
              "status": "affected",
              "changes": [
                {
                  "at": "21c16168263275541a6e076d0c31852c40e09a18",
                  "status": "unaffected"
                },
                {
                  "at": "33a052daa386c4ce08a9c39a07fc90f353ff6a51",
                  "status": "unaffected"
                },
                {
                  "at": "6ed2e213e9d5a19a70d7fcad5a8d616622cd2084",
                  "status": "unaffected"
                }
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            }
          ]
        }
      ]
    }
  ],
  "metrics": {
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          "attackRequirements": "NONE",
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          "userInteraction": "ACTIVE",
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          "vulnIntegrityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
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          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
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    "cvssMetricV31": [
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