CVE-2026-102407
Medium
Description
Incorrect Authorization (CWE-863) in Elasticsearch can lead to unauthorized data stream modification via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). An authenticated user with sufficient privileges over a single resource could use the Modify Data Streams API to modify a data stream to which they were not otherwise authorized, potentially injecting data into it or affecting its ability to be searched normally. This issue does not allow an attacker to read the contents of a data stream they do not otherwise have access to.
SeverityMedium
CVSS5.4
Exploit probability—
Product
Elasticsearch
PublishedOct 6, 2026
First seenOct 6, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- elastic elasticsearch8.19.19, 9.3.8, 9.4.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| elastic elasticsearch | 7.17.5 ≤ v ≤ 7.17.29, 8.2.2 ≤ v < 8.19.19, 9.0.0 ≤ v < 9.3.8, 9.4.0 ≤ v < 9.4.4 | 8.19.19, 9.3.8, 9.4.4 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.