AIKIDO-2026-589778
livebook is vulnerable to Authentication Bypass
77
CVE Score
High
Authentication Bypass
TL;DR
A Livebook agent or app server connected to Livebook Teams caches its deployment group identifier and resolves it on each request to decide whether Teams identity enforcement is active. The client does not distinguish an unresolvable deployment group from one with enforcement disabled, so an unresolved group reports enforcement as off and requests fall through to unauthenticated access. This occurs when a deployment group is deleted while the agent is disconnected or reconnecting, after which any client reaching the server is granted fully privileged access. The fix makes the identity check fail closed when the deployment group cannot be resolved.
How do I fix this?
Upgrade the livebook library to the patch version.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you run a Livebook agent or app server that relies on Livebook Teams identity enforcement.
Package
Versions
0.19.7 - 0.19.8
Fixed in 0.19.9Background info
livebook is vulnerable to Authentication Bypass in versions 0.19.7 - 0.19.8.
Links
GitHub Release
Fix Commits
github.com/livebook-dev/livebook/commit/2d3a2c710c880abd24a2bc888d3cf5239d98cf72github.com/livebook-dev/livebook/commit/d374e90647edbb00286bfee9182c0161d29a8e07github.com/livebook-dev/livebook/commit/d6d0dfa746b172540442852f74de4a9deacc433b
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