CVE-2026-16145 json
Invisible Anti-Spam & CAPTCHA <= 5.1 - Unauthenticated Stored Cross-Site Scripting via 'action' Parameter
published 2026-08-15 2 mo ago modified 2026-08-20 2 mo ago also EUVD-2026-58864
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected products
- matthiasnordwig Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/ff1d2bd8-cc46-4763-8ba7-832b982ff56a?source=cve
- plugins.trac.wordpress.org /browser/gdpr-compliant-recaptcha-for-all-forms/tags/5.0/includes/class-message-page.php#L621
- plugins.trac.wordpress.org /browser/gdpr-compliant-recaptcha-for-all-forms/tags/5.0/includes/class-stamp.php#L136
- plugins.trac.wordpress.org /browser/gdpr-compliant-recaptcha-for-all-forms/tags/5.0/includes/class-stamp.php#L771
- plugins.trac.wordpress.org /changeset/3633500/gdpr-compliant-recaptcha-for-all-forms
Sources
- CVE List CVE-2026-16145
- NVD CVE-2026-16145
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.