Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2017-15878

31
FAUCET Score

CVE-2017-15878 is a cross-site scripting (XSS) vulnerability affecting KeystoneJS versions prior to 4.0.0-beta.7, specifically within the fields/types/markdown/MarkdownType.js component accessible via the Contact Us feature. This medium-severity vulnerability (CVSS 6.1) can be exploited remotely with low attack complexity, requiring user interaction, and could lead to limited confidentiality and integrity impacts. While not present in the KEV catalog and lacking significant community discussion or media coverage, a public exploit (EDB-43054) exists for KeystoneJS 4.0.0-beta.5, indicating potential for exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.0.0CPE matchmatch criteria
cpe:2.3:a:keystonejs:keystone:*:beta7:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

CVSS:3.0/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
3.0

Exploit Intelligence

EPSS Score
3.42%
Probability of exploitation in next 30 days
EPSS Percentile
87.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-43054 · Oct 25, 2017
This CVE's current EPSS score of 0.0341 is in the 94th percentile among its peer group of 26,220 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
npmpatch availablevia ghsa
Product: keystoneFixed in: 4.0.0

Vendor Advisories (1)

npmGHSA-7qcx-jmrc-h2rrmedium

Cross-Site Scripting in keystone

Nov 15, 2017

References

blog.securelayer7.net / keystonejs-open-source-penetration-testing-report
Issue TrackingThird Party Advisory
github.com / keystonejs/keystone/pull/4478
Issue TrackingPatchThird Party Advisory
packetstormsecurity.com / files/144756/KeystoneJS-4.0.0-beta.5-Unauthenticated-Stored-Cross-Site-Scripting.html
ExploitIssue TrackingPatchThird Party AdvisoryVDB Entry
exploit-db.com / exploits/43054
ExploitIssue TrackingPatchThird Party AdvisoryVDB Entry
securityfocus.com / bid/101541
Third Party AdvisoryVDB Entry