Elk: Incorrect Authorization in Kibana Agent Builder Leading to Disclosure and Tampering of Private Agents (CVE-2026-72643)
Kibana Agent Builder determines whether a caller owns a private agent by comparing a stable user identifier when one is recorded, and falling back to a comparison of the username when it is not. A username is not unique across Elasticsearch authentication realms, so two distinct principals that share a username in different realms are treated as the same owner. This discloses the configuration and instructions of an agent the caller does not own, and allows that agent to be altered or removed.
Elk: Incorrect Authorization in Kibana Agent Builder Leading to Disclosure and Tampering of Private Agents (CVE-2026-72643)
Description
Kibana Agent Builder determines whether a caller owns a private agent by comparing a stable user identifier when one is recorded, and falling back to a comparison of the username when it is not. A username is not unique across Elasticsearch authentication realms, so two distinct principals that share a username in different realms are treated as the same owner. This discloses the configuration and instructions of an agent the caller does not own, and allows that agent to be altered or removed.
Affected software
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-kibana-2026-72643
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-72643"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- High
- Cvss Version
- null
Threat ID: 6a85b4aaacd9273b49250f25
Added to database: 08/19/2026, 13:50:34 UTC
Last updated: 08/19/2026, 13:51:31 UTC
Views: 1
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