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High severity · published Sep 1, 2026
CVE-2026-78607
Missing Authorization in Elasticsearch Leading to Information Disclosure
7.1
CVSS
0.3%
EPSS
No
On KEV
Description
Missing Authorization (CWE-862) in the Elasticsearch custom inference service can lead to information disclosure via Privilege Abuse (CAPEC-122). A user holding only inference execution privileges could cause outbound inference traffic to be directed to a destination of their choosing and could cause administrator-provisioned credentials to be exposed.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Elasticsearch · Elastic
8.0.0 through 8.19.18; 9.0.0 through 9.3.7; 9.4.0 through 9.4.3; 9.5.0 · source: vendor, NVD
Affected product
EL
Elasticsearch
Elastic
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78607
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78607
Vendor Advisory
https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-9-5-1-security-update-esa-2026-143/390094
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