Reported vulnerability
Instant Popup Builder <= 1.1.7 - Unauthenticated Arbitrary Shortcode Execution via 'token' Parameter
Published 18 Mar 2026
Updated 19 Mar 2026
CVE-2026-3475
Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.
Does this affect my version?
Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.
Wordfence advisory
medium · CVSS 5.3The Instant Popup Builder plugin for WordPress is vulnerable to Unauthenticated Arbitrary Shortcode Execution in all versions up to and including 1.1.7. This is due to the handle_email_verification_page() function constructing a shortcode string from user-supplied GET parameters (token, email) and passing it to do_shortcode() without properly sanitizing square bracket characters, combined with missing authorization checks on the init hook. While sanitize_text_field() and esc_attr() are applied, neither function strips or escapes square bracket characters ([ and ]). WordPress's shortcode regex uses [^\]\/]* to match content inside shortcode tags, meaning a ] character in the token value prematurely closes the shortcode tag. This makes it possible for unauthenticated attackers to inject and execute arbitrary registered shortcodes by crafting a malicious token parameter containing ] followed by arbitrary shortcode syntax.
Severity vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Instant Popup Builder – Popup Maker for Videos, Forms, Offers, Announcements, Galleries & Exit Intent
- Software
- plugin · instant-popup-builder
- Affected versions
- Start version unspecified, through 1.1.7
- Fix availability
- Fix available
- Fixed versions
- 1.1.8
Recommended action
Update to version 1.1.8, or a newer patched version
Further references (1)
Data sources and licences
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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
Read licence termsSource: Wordfence
Need help fixing this issue?
Get help checking your site, applying an available update and resolving any problems after updating.
Get help with this issueQuestions about this vulnerability
Which versions of Instant Popup Builder – Popup Maker for Videos, Forms, Offers, Announcements, Galleries & Exit Intent are affected?
Wordfence lists these affected versions: Start version unspecified, through 1.1.7. Use the version checker above to compare your installed release with this report.
Is a fix available for Instant Popup Builder – Popup Maker for Videos, Forms, Offers, Announcements, Galleries & Exit Intent?
Wordfence reports a fix for this issue in Instant Popup Builder – Popup Maker for Videos, Forms, Offers, Announcements, Galleries & Exit Intent. It lists these fixed versions: 1.1.8. Back up your website and test the recommended update before applying it to your live site.
Where can I find my installed plugin version?
In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.
Does an affected version mean my website has been hacked?
An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.