# CVE-2023-6000: Popup Builder - XSS

> Live exploitation tracking for CVE-2023-6000 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2023-6000

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 6.1
- **Public exploit available:** Yes
- **Affected products:** Popup Builder
- **Weaknesses:** CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))
- **Tags:** wordpress

## Description

The Popup Builder WordPress plugin before 4.2.3 does not prevent simple visitors from updating existing popups, and injecting raw JavaScript in them, which could lead to Stored XSS attacks.

## CrowdSec analysis

[CVE-2023-6000](https://euvd.enisa.europa.eu/vulnerability/CVE-2023-6000) is a vulnerability in the Popup Builder WordPress plugin prior to version 4.2.3 that allows unauthenticated visitors to modify existing popups and inject arbitrary JavaScript, resulting in stored cross-site scripting (XSS) attacks. This flaw could enable attackers to execute malicious scripts in the browsers of site visitors, potentially leading to data theft or session hijacking.

CrowdSec has been tracking this vulnerability and its exploits since 24th of September 2025.

CrowdSec has not observed any significant exploitation activity targeting CVE-2023-6000 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.

Attackers exploit the Popup Builder plugin by sending unauthenticated POST requests to the WordPress root endpoint with parameters like `sgpb-is-preview`, `post_ID`, and `sgpb-WillOpen` containing malicious JavaScript, resulting in stored XSS on vulnerable sites.

## Timeline

- 2024-01-01: CVE Published. CVE-2023-6000 is published to NVD.
- 2025-09-24: Rule Released. CrowdSec releases a rule to detect CVE-2023-6000 exploitation attempts against the CrowdSec Network.
- 2025-12-17: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2023-6000 for the first time.

## References

- https://wpscan.com/blog/stored-xss-fixed-in-popup-builder-4-2-3/
- https://wpscan.com/vulnerability/cdb3a8bd-4ee0-4ce0-9029-0490273bcfc8
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-6000.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2023-6000) follows observed exploitation activity for CVE-2023-6000. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.