CVE-2026-66298Network attack vector

Notebook code execution via synthetic keyboard events

Published Aug 5, 2026 · Updated Aug 5, 2026

Origin validation failure in affected Dashbit Livebook releases allows attackers to execute notebook code after opening a malicious notebook. The JS-view iframe forwards synthetic keydown events without checking Event.isTrusted, and the parent reconstructs them for capture-phase global shortcut handling. Rendering untrusted notebook output, including output mirrored to collaborators, can therefore queue every cell for evaluation or restart the runtime without confirmation.

CVSS severity8.6
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation failure in affected Dashbit Livebook releases allows attackers to execute notebook code after opening a malicious notebook. The JS-view iframe forwards synthetic keydown events without checking Event.isTrusted, and the parent reconstructs them for capture-phase global shortcut handling. Rendering untrusted notebook output, including output mirrored to collaborators, can therefore queue every cell for evaluation or restart the runtime without confirmation.

The record

CVE
CVE-2026-66298
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Dashbit
Product
Livebook
Classifications
CWE-346, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.19.0 <0.19.9
  2. Affected versionversion=0.19.0-cuda12 <0.19.9-cuda12
  3. Affected versionversion=0.5.0 <0.18.7
  4. Affected versionversion=0.5.0-cuda12 <0.18.7-cuda12
  5. Affected versionversion=844242ba80a928d0d675416d312a58003cb7771b <* changes=[{"at":"296318ffdfa6e5ed7b18ad8d5a5b2af90f3cd728","status":"unaffected"},{"at":"a552ce8f99ad348ea37061394dc950a0cebdb33e","status":"unaffected"},{"at":"5980e5c6b71036806b3bf54101eb1d6c0f50f19c","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Dashbit · Livebookversion=0.19.0 <0.19.9; version=0.19.0-cuda12 <0.19.9-cuda12; version=0.5.0 <0.18.7; version=0.5.0-cuda12 <0.18.7-cuda12; version=844242ba80a928d0d675416d312a58003cb7771b <* changes=[{"at":"296318ffdfa6e5ed7b18ad8d5a5b2af90f3cd728","status":"unaffected"},{"at":"a552ce8f99ad348ea37061394dc950a0cebdb33e","status":"unaffected"},{"at":"5980e5c6b71036806b3bf54101eb1d6c0f50f19c","status":"unaffected"}]

Published CVSS scores

8.6Erlang Ecosystem FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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