CVE WatchOct 13, 2026

CVE-2026-102407

Incorrect Authorization (CWE-863) in Elasticsearch can lead to unauthorized data stream modification via Accessing Functionality Not Properl

CVSS

5.4

Medium

EPSS

0.2%

p12

KEV

—

Exploit Today

0-100

Published: Oct 6, 2026 · Last modified: Oct 13, 2026 · CWE-863

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-10-072026-10-22

Technical 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.

Official references

discuss.elastic.cohttps://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-security-update-esa-2026-188/390861

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