CVE-2026-4818Network attack vector

Authenticated data-stream management via missing action restriction

Published Mar 31, 2026 · Updated Mar 31, 2026

Improper authorization in Search Guard FLX 3.0.0 through 4.0.1 allows remote authenticated users to manage data streams without privileges. The authorization layer fails to reserve the indices:admin/data_stream/modify action for administrators, exposing management operations to insufficiently privileged roles. Reachability requires authenticated network access; successful operations can disclose or alter protected data-stream content without interrupting service.

CVSS severity6.8
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Search Guard FLX 3.0.0 through 4.0.1 allows remote authenticated users to manage data streams without privileges. The authorization layer fails to reserve the indices:admin/data_stream/modify action for administrators, exposing management operations to insufficiently privileged roles. Reachability requires authenticated network access; successful operations can disclose or alter protected data-stream content without interrupting service.

The record

CVE
CVE-2026-4818
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
floragunn GmbH
Product
Search Guard FLX
Classifications
CWE-862, CWE-285
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.0 <=4.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

floragunn GmbH · Search Guard FLXversion=3.0.0 <=4.0.1

Published CVSS scores

6.8floragunn GmbHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-285Improper Authorization

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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