Is CVE-2026-102407 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-102407 being exploited in the wild.

How severe is CVE-2026-102407?

Medium severity, with a CVSS score of 5.4, published 6 October 2026.

Which products and versions are affected?

Elasticsearch 7.17.5–7.17.29, 8.2.2–8.19.18, 9.0.0–9.3.7, 9.4.0–9.4.3.

Is there a fix for CVE-2026-102407?

Yes: fixed in Elasticsearch 8.19.19, 9.3.8, 9.4.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-102407 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-102407?

Check whether you run Elasticsearch at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-102407: Elastic Elasticsearch incorrect authorization in data streams

CVE-2026-102407 · Severity: medium · CVSS 5.4 · Published 2026-10-06

Elasticsearch, a search and analytics platform widely used for log and data analysis, contains an authorization flaw in its data stream modification API. An authenticated user with limited privileges could modify data streams they shouldn't have access to, potentially injecting or corrupting data. The vulnerability does not allow attackers to read restricted data, only to modify or disrupt it.

Technologies: Elasticsearch. Vendors: Elastic.

Quick answers

Is CVE-2026-102407 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-102407 being exploited in the wild.
How severe is CVE-2026-102407?: Medium severity, with a CVSS score of 5.4, published 6 October 2026.
Which products and versions are affected?: Elasticsearch 7.17.5–7.17.29, 8.2.2–8.19.18, 9.0.0–9.3.7, 9.4.0–9.4.3.
Is there a fix for CVE-2026-102407?: Yes: fixed in Elasticsearch 8.19.19, 9.3.8, 9.4.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-102407 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-102407?: Check whether you run Elasticsearch at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Elasticsearch 8.19.19, 9.3.8, 9.4.4

Technical details

The Modify Data Streams API in Elasticsearch fails to properly enforce role-based access control (ACLs), allowing authenticated users to modify data streams beyond their assigned privileges. An authenticated attacker with privileges over one resource can exploit this to modify a data stream they lack authorization for, either injecting malicious data or degrading search functionality. A fix is available in patched versions.

Affected products

Elastic Elasticsearch 7.17.5–7.17.29, 8.2.2–8.19.18, 9.0.0–9.3.7, 9.4.0–9.4.3

Timeline

2026-10-06: disclosed

References

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

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