CVE-2017-15878

mediumpriority · track · 35EPSS 0.034 · 89 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

3.42% (89th) EPSS

CVSS 4.3 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

A cross-site scripting (XSS) vulnerability exists in fields/types/markdown/MarkdownType.js in KeystoneJS before 4.0.0-beta.7 via the Contact Us feature.

cvss

Technical severity, 0–10. One row per scoring source.

6.1

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.06.1mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7

v3.06.1mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · OSV

v3.05.8mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79US

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-43054KeystoneJS 4.0.0-beta.5 - Cross-Site ScriptingPoC · exploit_db

affected products (3)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
keystonejs keystone< 4.0.0nvdUScpe:2.3:a:keystonejs:keystone:*:*:*:*:*:*:*:*
npm keystone< 4.0.0osvUSpkg:npm/keystone

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-7qcx-jmrc-h2rrCross-Site Scripting in keystone2017-11-15ghsa · osvUS
Versions of `keystone` prior to 4.0.0 are vulnerable to Cross-Site Scripting (XSS). The package fails to sanitize user input on the `Contact Us` page, allowing attackers to submit contact forms with malicious JavaScript in the message field. The output is not properly encoded leading an admin that opens new inquiry to execute the arbitrary JavaScript supplied in their browser. ## Recommendation Update to version 4.0.0 or later.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2017-10-24modified 2026-06-17

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+53051 more

references (11)

External citations — patches, advisories, analysis.

scry

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