Auth bypass in Elastic Kibana
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 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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (17.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 17.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Elastic Kibana — versions 9.2.0
Weakness classification (CWE)
References
- discuss.elastic.co/t/kibana-9-4-5-security-update-esa-2026-82/389535 (Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-72680?
- CVE-2026-72680 is a medium-severity vulnerability in Elastic Kibana, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-08-13.
- How severe is CVE-2026-72680?
- Medium severity. CVSS v3 base score is 6.5 out of 10.