CVE-2018-1000855

Name: CVE-2018-1000855
Creator: NVD / NIST
Published: 2018-12-20T17:29:00.317+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.90%

Last modified Jun 17, 2026

CVE-2018-1000855 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 0.90% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.90%

55.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Basecamp	Easymon	<= 1.4

References

https://github.com/basecamp/easymon/issues/26Patch, Third Party Advisory
https://github.com/basecamp/easymon/pull/25Patch, Third Party Advisory
https://github.com/basecamp/easymon/issues/26Patch, Third Party Advisory
https://github.com/basecamp/easymon/pull/25Patch, Third Party Advisory

Timeline

Published: Dec 20, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-1000855?

How severe is CVE-2018-1000855?

CVE-2018-1000855 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.90% probability of exploitation in the next 30 days.

How do I fix CVE-2018-1000855?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-1000855?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST