CVE-2026-104800: File Upload RCE (CVSS 9.8)

Description

The AGE-GATE plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.0 via the 'width (and height)' parameter parameter. This is due to missing authentication, capability checks, and nonce verification on the standalone admin.php endpoint, combined with unsanitized injection of POST parameters directly into generated PHP source written to an included file. This makes it possible for unauthenticated attackers to execute code on the server. This is possible because admin.php does not load WordPress and carries no ABSPATH guard, making it a fully unauthenticated entry point regardless of the decorative capability arguments registered via the plugin's simulated menu API.

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CVSS v3.1 Score

9.8

CRITICAL

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

EPSS — Exploit Prediction

0.0103

Probability of exploitation

0.63%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-434 Unrestricted Upload

References

Other References

https://plugins.trac.wordpress.org/browser/wp-site-age-gate/trunk/admin.php https://plugins.trac.wordpress.org/browser/wp-site-age-gate/trunk/agegate.php#L161 https://plugins.trac.wordpress.org/browser/wp-site-age-gate/trunk/main.php#L213 https://plugins.trac.wordpress.org/browser/wp-site-age-gate/trunk/main.php#L279 https://plugins.trac.wordpress.org/browser/wp-site-age-gate/trunk/main.php#L291 https://plugins.trac.wordpress.org/browser/wp-site-age-gate/trunk/main.php#L325 https://plugins.trac.wordpress.org/browser/wp-site-age-gate/trunk/nonwp.php#L20 https://www.wordfence.com/threat-intel/vulnerabilities/id/05db28b4-a3de-402d-bc5b-06d5347d6724?source=cve

Frequently Asked Questions

What is CVE-2026-104800? +

The AGE-GATE plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.0 via the 'width (and height)' parameter parameter. This is due to missing authentication, capability checks, and nonce verification on the standalone admin.php endpoint, combined with unsanitized injection of POST parameters directly into generated PHP source written to an included file. This makes it possible for unauthenticated attackers to execute code on the server. This is possible because admin.php does not load WordPress and carries no ABSPATH guard, making it a fully unauthenticated entry point regardless of the decorative capability arguments registered via the plugin's simulated menu API. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-104800? +

CVE-2026-104800 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0103, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-104800? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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