Threats Tagged 'cve-2026-72680'

CVE-2026-72680 is an authorization bypass vulnerability in Kibana Agent Builder's A2A JSON-RPC API. An authenticated user with only read privileges can supply a user-controlled identifier to replace another user's stored conversation within the same space. This causes the original owner to lose access to the conversation and its history permanently. The attacker cannot read the overwritten content, limiting the impact to integrity and availability loss of the affected conversation.

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.