WP Security CheckVulnerability data as of October 17, 2026

Vulnerability alerts / October 16, 2026

Vulnerability in Popup Box – Create Countdown, Coupon, Video, Contact Form Popups — CVE-2026-100159

MediumSeverity
CVSS 4.8
0.3%Estimated exploit probability
EPSS
50,000+ sitesInstalls
6.4.3Fixed in

What to do now

Update Popup Box – Create Countdown, Coupon, Video, Contact Form Popups to 6.4.3 or later.

Affected versions

  • 6.4.1 to 6.4.2 (inclusive)

Affected: Popup Box – Create Countdown, Coupon, Video, Contact Form Popups (plugin, ays-popup-box)

Check: The plugin on wordpress.org / Our record for Popup Box – Create Countdown, Coupon, Video, Contact Form Popups

What the vulnerability is

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.

This description is reproduced verbatim from the public vulnerability record.

Sources

This page is compiled automatically from public databases. Accuracy is not guaranteed; confirm against the vendor advisory before acting.

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