CVE-2026-68746

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.8% (55th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.8%
EPSS %ILE
55th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 10, 2026

Advisory Details (6)

Auto-updated Aug 5, 2026
Patch available. Sources: github, github_commit.
github_commit

commit 2d3a2c710c88 (livebook-dev/livebook)

Fix landed in livebook-dev/livebook commit 2d3a2c710c88 — awaiting tagged release

https://github.com/livebook-dev/livebook/commit/2d3a2c710c880abd24a2bc888d3cf5239d98cf72
github_commit

commit d6d0dfa746b1 (livebook-dev/livebook)

Fix landed in livebook-dev/livebook commit d6d0dfa746b1 — awaiting tagged release

https://github.com/livebook-dev/livebook/commit/d6d0dfa746b172540442852f74de4a9deacc433b
github_commit

commit d374e90647ed (livebook-dev/livebook)

Fix landed in livebook-dev/livebook commit d374e90647ed — awaiting tagged release

https://github.com/livebook-dev/livebook/commit/d374e90647edbb00286bfee9182c0161d29a8e07
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-68746
generic

CVE-2026-68746

https://cna.erlef.org/cves/CVE-2026-68746.html
githubMentions a patch (unverified)

Livebook Teams Identity fails open to full unauthenticated access after a deployment group becomes unresolvable in the agent local cache · Advisory · livebook-dev/livebook · GitHub

https://github.com/livebook-dev/livebook/security/advisories/GHSA-74j5-6grg-g6wj

Affected Packages

(1 across 1 ecosystem)
Hex(1)
PackageVulnerable rangeFix by version rangeDependents
livebook0.19.7, 0.19.8
  • 0.19.7 up to 0.19.9: fixed in 0.19.9
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
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  75. 2026-08-10 16:49 UTCEG score recompute▲ 1.10

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Frequently asked(5)

What is CVE-2026-68746?
CVE-2026-68746 is a high vulnerability published on August 5, 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…
When was CVE-2026-68746 disclosed?
CVE-2026-68746 was first published on August 5, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-68746 actively exploited?
CVE-2026-68746 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (55th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-68746?
CVE-2026-68746 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-68746?
A fix for CVE-2026-68746 is available: update to the fixed version the vendor names in its advisory.

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