CVE-2026-72632 Observable Discrepancy in Kibana Fleet Leading to Disclosure of Elastic Agent Elasticsearch API Keys
Attackers can reconstruct Elastic Agent Elasticsearch API keys via a side channel in Kibana Fleet's agent listing capability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72632?
CVE-2026-72632 is a high-severity vulnerability in Elastic Kibana, published on 13 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Observable Discrepancy (CWE-203) in Kibana Fleet can lead to information disclosure via Excavation (CAPEC-116). Fleet removes the Elasticsearch API key value of an enrolled Elastic Agent from the responses of its agent listing capability, but that capability accepted caller-supplied filter expressions over the stored field that holds the value, and evaluated them with Kibana's own internal Elasticsearch privileges rather than the caller's. Because the number of matching agents is reported back to the caller, the difference between a matching and a non-matching filter formed a side channel from which the full API key value could be reconstructed one character at a time with a short sequence of requests.
Weakness: CWE-203
Which versions are affected by CVE-2026-72632?
2 open source packages ship an affected version, including kibana and elk. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
kibana Bitnami | From 8.19.0 | 8.19.20, 9.4.5, 9.5.1 |
elk Bitnami | From 8.19.0 | 8.19.20, 9.4.5, 9.5.1 |
Products include Elastic Kibana.
How do I fix CVE-2026-72632?
Upgrade kibana to a fixed version for your release line: 8.19.20, 9.4.5 or 9.5.1.
Is CVE-2026-72632 being exploited?
There is no known exploitation of CVE-2026-72632 in the wild and no public exploit code.
Other vulnerabilities in Elastic Kibana
Sources
Also known as BIT-elk-2026-72632, BIT-kibana-2026-72632, GHSA-hm4v-vwxq-29j4, MINI-592h-7gfp-qg56, MINI-8xww-8vh4-95rg, MINI-gpv9-72w7-w7fr and 4 more.