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Shield Security <= 21.0.8 — Unauthenticated Reflected Cross-Site Scripting via 'message' Parameter

CVE-2026-0561Published · Updated

Action summary

Affected: ≤21.0.8Update to 21.0.10 or newer

All remediation steps
Watch plugin
Severity
Medium6.1
CVSS
6.1
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:R User interaction
Required
S:C Scope
Changed
C:L Confidentiality
Low
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-79 Cross-Site Scripting
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Shield Security – Smart Bot Blocking, Brute-Force Login Protection & File Scanning wp-simple-firewall

  1. Affected≤ 21.0.8
  2. Patched in21.0.10

Update to 21.0.10 or newer.

You are affected if you run ≤ 21.0.8. Version 21.0.10 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Shield Security – Smart Bot Blocking, Brute-Force Login Protection & File Scanning.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 21.0.10, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Shield Security – Smart Bot Blocking, Brute-Force Login Protection & File Scanning to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Dmitrii Ignatyev.

The Shield Security plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'message' parameter in all versions up to, and including, 21.0.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Shield Security – Smart Bot Blocking, Brute-Force Login Protection & File Scanning

All 12
More vulnerabilities in Shield Security – Smart Bot Blocking, Brute-Force Login Protection & File Scanning
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Request Path (REQUEST_URI) in Traffic Log
≤22.3.2Update to 22.3.4
CVE-2026-118057
Medium6.5Cross-Site Request Forgery to SQL Injection
≤21.0.8Update to 21.0.10
CVE-2026-0722
Medium4.3Missing Authorization to Authenticated (Subscriber+) Email MFA Update
≤21.0.9Update to 21.0.10
CVE-2025-14427
Medium4.3Authenticated (Subscriber+) Insecure Direct Object Reference to Disable Google Authenticator
≤21.0.9Update to 21.0.10
CVE-2025-15370
Medium6.1Reflected Cross-Site Scripting
≤20.0.5Update to 20.0.6
CVE-2024-7313

Same weakness (Cross-Site Scripting)

All Cross-Site Scripting
Other Cross-Site Scripting vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity medium, CVSS 6.1

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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