CVE-2023-4390 — The Popup box WordPress plugin before 3

The Popup box WordPress plugin before 3.7.2 does not sanitize and escape some Popup fields, which could allow high-privilege users such as an administrator to inject arbitrary web scripts even when the unfiltered_html capability is disallowed (for example in a multisite setup).

01What is this vulnerability?

The Popup box WordPress plugin before 3.7.2 does not sanitize and escape some Popup fields, which could allow high-privilege users such as an administrator to inject arbitrary web scripts even when the unfiltered_html capability is disallowed (for example in a multisite setup).

02Affected products

Vendor	Product	Versions
Unknown	Popup box	0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-10-31T13:54:45.161Z
• Last modified: 2025-04-23T16:10:06.020Z

09References

• wpscan.com — https://wpscan.com/vulnerability/9fd2eb81-185d-4d42-8acf-925664b7cb2f