CVE-2023-51542Network attack vector

Unauthenticated IP-restriction bypass via untrusted client address

Published Jun 4, 2024 · Updated Apr 28, 2026

Authentication bypass in WPMU DEV Branda 3.4.14 and earlier allows remote attackers to evade configured IP restrictions. Public materials identify improper client-IP trust but do not disclose the header, function, or validation error that accepts a spoofed address. The IP-restriction feature must be enabled; the bypass changes access-control decisions without reported data disclosure or service interruption.

CVSS severity5.3
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authentication bypass in WPMU DEV Branda 3.4.14 and earlier allows remote attackers to evade configured IP restrictions. Public materials identify improper client-IP trust but do not disclose the header, function, or validation error that accepts a spoofed address. The IP-restriction feature must be enabled; the bypass changes access-control decisions without reported data disclosure or service interruption.

The record

CVE
CVE-2023-51542
Published
Jun 4, 2024
Updated
Apr 28, 2026
Vendor
WPMU DEV
Product
Branda
Classifications
CWE-290, CAPEC-1
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=3.4.14
  2. Affected versionversion=n/a <=3.4.14 changes=[{"at":"3.4.15","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WPMU DEV · Brandaversion=0 <=3.4.14; version=n/a <=3.4.14 changes=[{"at":"3.4.15","status":"unaffected"}]

Published CVSS scores

5.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo