CVE-2026-3475Network attack vector

Unauthenticated shortcode execution via token bracket injection

Published Mar 19, 2026 · Updated Mar 19, 2026

Shortcode injection in Seventh Sky Instant Popup Builder 1.1.7 and earlier allows remote attackers to execute registered shortcodes. The handle_email_verification_page() function embeds token and email GET values in a shortcode passed to do_shortcode(), but its sanitizers preserve brackets, allowing a token value to close the intended tag and append another shortcode. No account or user interaction is required; the resulting actions depend on the shortcodes registered by the WordPress installation.

CVSS severity5.3
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Shortcode injection in Seventh Sky Instant Popup Builder 1.1.7 and earlier allows remote attackers to execute registered shortcodes. The handle_email_verification_page() function embeds token and email GET values in a shortcode passed to do_shortcode(), but its sanitizers preserve brackets, allowing a token value to close the intended tag and append another shortcode. No account or user interaction is required; the resulting actions depend on the shortcodes registered by the WordPress installation.

The record

CVE
CVE-2026-3475
Published
Mar 19, 2026
Updated
Mar 19, 2026
Vendor
Seventh Sky
Product
Instant Popup Builder
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <=1.1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Seventh Sky · Instant Popup Builderversion=* <=1.1.7

Published CVSS scores

5.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo