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CVE-2018-1000855

21
FAUCET Score

CVE-2018-1000855 is a reflected Cross-Site Scripting (XSS) vulnerability affecting easymon version 1.4 and earlier, specifically within the Endpoint where monitoring is mounted, primarily impacting Firefox users. The vulnerability has a CVSS score of 6.1 (Medium) and requires user interaction, as a victim must click a crafted URL to trigger the XSS payload, potentially leading to cookie theft depending on cookie settings. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage. The vulnerability has been addressed in easymon version 1.4.1 and later.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.4CPE matchmatch criteria
cpe:2.3:a:basecamp:easymon:*:*:*:*:*:ruby:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.90%
Probability of exploitation in next 30 days
EPSS Percentile
55.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0090 is in the 67th percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rubygemspatch availablevia ghsa
Product: easymonFixed in: 1.4.1

Vendor Advisories (1)

rubygemsGHSA-c289-47qf-rvrrmedium

Cross Site Scripting (XSS) vulnerability in easymon

Dec 21, 2018

References

github.com / basecamp/easymon/issues/26
PatchThird Party Advisory
github.com / basecamp/easymon/pull/25
PatchThird Party Advisory