CVE-2026-13342

Security Optimizer – The All-In-One Protection <= 1.6.4 - IP Allowlist Bypass

2026-07-23 00:00

Strategic Overview

Status: Patched in 1.6.5
Affected Plugin: Security Optimizer – The All-In-One Protection Plugin
Affected Version: <= 1.6.4
CVSS: 5.3Medium
Weakness type: CWE-348 · Use of Less Trusted Source
CVE: CVE-2026-13342

View all Security Optimizer – The All-In-One Protection Plugin vulnerabilities

At a glance

CVE-2026-13342 is a medium-severity Use of Less Trusted Source vulnerability in the Security Optimizer WordPress plugin, affecting versions <= 1.6.4. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.6.5; sites on affected versions should update now. Disclosed July 2026, reported by Shivamani Vastrala.

Vulnerability Overview

The Security Optimizer – The All-In-One Protection Plugin plugin for WordPress is vulnerable to IP Allowlist Bypass in all versions up to, and including, 1.6.4. This makes it possible for unauthenticated attackers to bypass IP based restrictions.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-348: Use of Less Trusted Source

The product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack.

Remediation

Update to version 1.6.5, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Security Optimizer: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Security Optimizer 1.6.5 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-13342 https://www.wordfence.com/threat-intel/vulnerabilities/id/f04765fb-7144-4e6f-ab5a-5a06b45dbb17 https://nvd.nist.gov/vuln/detail/CVE-2026-13342

Related records

Other vulnerabilities in Security Optimizer – The All-In-One Protection Plugin

CVSS Vector

5.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

This record contains material that is subject to copyright

CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

https://www.cve.org/Legal/TermsOfUse

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/