CVE-2026-68746 (GCVE-0-2026-68746)
Vulnerability from cvelistv5 – Published: 2026-08-05 19:43 – Updated: 2026-08-06 14:48
VLAI
EPSS
VEX
Title
Livebook Teams identity check fails open when the deployment group is unresolvable, allowing unauthenticated access
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 14:45 UTC
CWE
- CWE-636 - Not Failing Securely ('Failing Open')
Assigner
References
6 references
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| livebook-dev | livebook |
Affected:
0.19.7 , < 0.19.9
(semver)
cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:* |
|
| livebook-dev | livebook |
Affected:
0.19.7 , < 0.19.9
(other)
Affected: 0.19.7-cuda12 , < 0.19.9-cuda12 (other) cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:* |
|
| livebook-dev | livebook |
Affected:
fc2c87c6b0276705281842acbe17142d1ac4d555 , < *
(git)
cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:* |
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A connected agent may still reach an unresolvable cached deployment group as a result of connection failures or network errors.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThis vulnerability affects Livebook servers that enforce identity through Livebook Teams. Servers not connected to Livebook Teams, or connected without a deployment group, are not affected.\u003c/p\u003e\\n\u003cp\u003eLivebook Teams has also been changed to reject deletion of a deployment group while agents belonging to it are connected, which removes the most direct route into the vulnerable state. A connected agent may still reach an unresolvable cached deployment group as a result of connection failures or network errors.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"This vulnerability affects Livebook servers that enforce identity through Livebook Teams. Servers not connected to Livebook Teams, or connected without a deployment group, are not affected.\\n\\nLivebook Teams has also been changed to reject deletion of a deployment group while agents belonging to it are connected, which removes the most direct route into the vulnerable state. A connected agent may still reach an unresolvable cached deployment group as a result of connection failures or network errors.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.19.9\", \"versionStartIncluding\": \"0.19.7\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-05T19:43:38.188Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-68746\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-06T14:48:46.790Z\", \"dateReserved\": \"2026-07-31T13:23:00.354Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-08-05T19:43:38.188Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| Author | Source | Type | Date | Other |
|---|
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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