Vulnerability Description
The WP Captcha PRO (the premium version of the Advanced Google reCAPTCHA plugin, both have the same slug) plugin for WordPress is vulnerable to arbitrary file upload in all versions up to, and including, 5.38. This is due to a capability check in the save_ajax() function of the licensing module, combined with unrestricted file extraction in sync_cloud_protection(). This makes it possible for authenticated attackers, with Subscriber-level access and above, to upload arbitrary files including PHP webshells to the server by injecting a malicious cloud_protection_url into the license meta, which the plugin then downloads and extracts without file type validation into a web-accessible uploads directory. This can be used for remote code execution. Note: The vulnerability can only be exploited with a remote URL if "allow_url_fopen" is enabled in the php.ini config.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://getwpcaptcha.com
- https://www.wordfence.com/threat-intel/vulnerabilities/id/92652339-ec86-4069-aee
FAQ
What is CVE-2026-5411?
CVE-2026-5411 is a vulnerability with a CVSS score of 8.8 (HIGH). The WP Captcha PRO (the premium version of the Advanced Google reCAPTCHA plugin, both have the same slug) plugin for WordPress is vulnerable to arbitrary file upload in all versions up to, and includi...
How severe is CVE-2026-5411?
CVE-2026-5411 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-5411?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.