CVE WatchAug 13, 2026

CVE-2026-72680

Kibana Agent Builder A2A JSON-RPC API endpoint derives the identifier of a stored conversation from a user-supplied input, and the ownership

CVSS

6.5

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 13, 2026 · Last modified: Aug 13, 2026 · CWE-639

EPSS · 30d

Not enough EPSS history yet.

Technical description

Kibana Agent Builder A2A JSON-RPC API endpoint derives the identifier of a stored conversation from a user-supplied input, and the ownership check on that identifier does not distinguish between a conversation that does not exist and one that exists but belongs to another user. As a result, an authenticated user holding only the Agent Builder read privilege can supply an identifier already in use by another user in the same space and cause that user's conversation to be replaced and reassigned to the requesting account. The original owner permanently loses access to the conversation and its history. The impact is limited to loss of integrity and availability of the affected conversation; the attacker does not read the overwritten content.

Official references

discuss.elastic.cohttps://discuss.elastic.co/t/kibana-9-4-5-security-update-esa-2026-82/389535

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