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CVE-2026-68746

PUBLISHED 05.08.2026

CNA: EEF

Livebook Teams identity check fails open when the deployment group is unresolvable, allowing unauthenticated access

Обновлено: 05.08.2026
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.

CWE

Идентификатор Описание
CWE-636 When the product encounters an error condition or failure, its design requires it to fall back to a state that is less secure than other options that are available, such as selecting the weakest encryption algorithm or using the most permissive access control restrictions.

CVSS

Оценка Severity Версия Базовый вектор
7.7 HIGH 4.0 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

Доп. Информация

Product Status

livebook
Product: livebook
Vendor: livebook-dev
Default status: unaffected
Версии:
Затронутые версии Статус
Наблюдалось в версиях от 0.19.7 до 0.19.9 affected
СPE:
  • cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*
livebook
Product: livebook
Vendor: livebook-dev
Default status: unaffected
Версии:
Затронутые версии Статус
Наблюдалось в версиях от 0.19.7 до 0.19.9 affected
Наблюдалось в версиях от 0.19.7-cuda12 до 0.19.9-cuda12 affected
СPE:
  • cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*
livebook
Product: livebook
Vendor: livebook-dev
Default status: unaffected
Версии:
Затронутые версии Статус
Наблюдалось в версиях от fc2c87c6b0276705281842acbe17142d1ac4d555 до * affected
СPE:
  • cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*
 

Ссылки

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