CVE-2026-19223Network attack vectorHinoki check available

Network-wide code execution via unrestricted Hub setting

Published Aug 27, 2026 · Updated Aug 27, 2026

Code injection in WPMU DEV Smush 3.22.1 through 4.3.1 allows remote authenticated users to execute code across a multisite network. The Hub Connector accepts a network-scoped setting write from a subsite administrator instead of restricting that operation to network administrators. The flaw requires WordPress multisite and administrator access to one constituent site; successful exploitation permits code execution across the entire network.

CVSS severity7.2
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Code injection in WPMU DEV Smush 3.22.1 through 4.3.1 allows remote authenticated users to execute code across a multisite network. The Hub Connector accepts a network-scoped setting write from a subsite administrator instead of restricting that operation to network administrators. The flaw requires WordPress multisite and administrator access to one constituent site; successful exploitation permits code execution across the entire network.

The record

CVE
CVE-2026-19223
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
WPMU DEV
Product
Smush
Classifications
CWE-94
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=3.22.1 <4.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPMU DEV · Smushversion=3.22.1 <4.3.2

Published CVSS scores

7.2CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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