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Invisible Anti-Spam & CAPTCHA <= 5.1 — Unauthenticated Stored Cross-Site Scripting via 'action' Parameter

CVE-2026-16145Published · Updated

Action summary

Affected: ≤5.1Update to 5.1.1 or newer

All remediation steps
Watch plugin
Severity
High7.2
CVSS
7.2
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:N User interaction
None
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?

Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms gdpr-compliant-recaptcha-for-all-forms

  1. Affected≤ 5.1
  2. Patched in5.1.1

Update to 5.1.1 or newer.

You are affected if you run ≤ 5.1. Version 5.1.1 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms.
  • 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 5.1.1, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Ivaylo.

The Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'action' parameter in all versions up to, and including, 5.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The stored payload is written by any unauthenticated admin-ajax.php request whose action value matches an entry in the plugin's explicit-actions list, which is auto-populated for common form builders at activation and requires no authentication gate to reach the save path.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

More in Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms

All 5
More vulnerabilities in Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms
SeverityVulnerabilityCVEPublished
Medium4.3Missing Authorization
≤5.1.0Update to 5.1.1
CVE-2026-91010
Medium4.9Authenticated (Editor+) SQL Injection via Pattern JSON Keys/Values
≤5.1Update to 5.1.1
CVE-2026-16146
Medium4.9Authenticated (Editor+) SQL Injection via 'key' Parameter
≤5.1Update to 5.1.1
CVE-2026-16094
Medium4.3Cross-Site Request Forgery
≤4.1.1Update to 4.1.2
CVE-2025-49283

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 high, CVSS 7.2

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers
[object Object]. 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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