ays-pro Popup Box Plugin up to 6.4.2 on WordPress User IP Address ays_autoembed code injection

Summaryinfo

A vulnerability was found in ays-pro Popup Box Plugin up to 6.4.2. It has been declared as critical. The affected element is the function Ays_Pb_Public::ays_autoembed of the component User IP Address. Executing a manipulation of the argument Client-IP/X-Forwarded-For/Forwarded/X-Forwarded/Forwarded-For can lead to code injection. This vulnerability is tracked as CVE-2026-100159. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in ays-pro Popup Box Plugin up to 6.4.2 and classified as critical. This vulnerability affects the function Ays_Pb_Public::ays_autoembed of the component User IP Address. The manipulation of the argument Client-IP/X-Forwarded-For/Forwarded/X-Forwarded/Forwarded-For with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Popup Box plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions 6.4.1 to 6.4.2. This is due to the ays_popup_get_user_ip() function reading the client-controlled Client-IP / X-Forwarded-For / Forwarded / X-Forwarded / Forwarded-For request headers, sanitizing them only with sanitize_text_field() (which does not strip the bracket, quote, space, or '=' characters used by shortcode syntax), substituting the value into a popup body wherever the %%user_ip_address%% token appears (a raw str_replace with no escaping in Ays_Pb_Data::replace_message_variables()), and then passing the resulting body to do_shortcode() in Ays_Pb_Public::ays_autoembed() at output on the wp_footer hook. This makes it possible for unauthenticated attackers to execute arbitrary registered shortcodes with attacker-supplied attributes on the server whenever an administrator has added the %%user_ip_address%% token to a popup's Custom Content body, which can be leveraged to read arbitrary data or perform other actions exposed by shortcodes installed on the site.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-100159 since 09/25/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/16/2026). This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• WordPress Plugin

Vendor

• ays-pro

Name

• Popup Box Plugin

Version

• 6.4.0
• 6.4.1
• 6.4.2

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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