Authorization bypass through user-controlled key in Kibana - CVE-2026-49089
Published: July 2, 2026
Vulnerability identifier: #VU136676
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-49089
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Elastic Stack
Affected software:
Kibana
Kibana
Detailed vulnerability description
The vulnerability allows a remote user to modify unauthorized data.
The vulnerability exists due to authorization bypass through user-controlled key in AI Assistant conversation access controls when handling requests that reference conversation identifiers. A remote user can supply another user's AI Assistant conversation identifier to modify a conversation they do not own to modify unauthorized data.
Exploitation requires knowledge of a hard-to-guess conversation identifier and access to the AI Assistant feature.
How to mitigate CVE-2026-49089
Install security update from vendor's website.