CVE-2026-19224Network attack vector

Network-wide code execution via unchecked network option

Published Sep 4, 2026 · Updated Sep 4, 2026

Code injection in WPMU DEV Hummingbird Performance 3.15.0 through 3.21.1 allows remote authenticated users to execute code network-wide. The Hub Connector accepts a network-scoped option from a subsite administrator without enforcing network-administrator authorization before applying it. A WordPress multisite deployment and administrator control of one member site are required, after which injected code runs across the network.

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

What happened

Code injection in WPMU DEV Hummingbird Performance 3.15.0 through 3.21.1 allows remote authenticated users to execute code network-wide. The Hub Connector accepts a network-scoped option from a subsite administrator without enforcing network-administrator authorization before applying it. A WordPress multisite deployment and administrator control of one member site are required, after which injected code runs across the network.

The record

CVE
CVE-2026-19224
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
WPMU DEV
Product
Hummingbird Performance
Classifications
CWE-94, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=3.15.0 <3.21.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WPMU DEV · Hummingbird Performanceversion=3.15.0 <3.21.2

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

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

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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