Echo Knowledge Base <= 17.214.0 - Reflected Cross-Site Scripting via 'new_kb_config' Parameter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-101935
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 08:16:29 UTC
Updated2026-10-29 02:16:45 UTC
DescriptionThe Echo Knowledge Base – Documentation, FAQs, Chat & Smart Search plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'new_kb_config' parameter (specifically the article-mobile-break-point-v2 key, among other config keys interpolated into the <style> element) in versions up to, and including, 17.214.0 This is due to insufficient input sanitization and output escaping in EPKB_Frontend_Editor::fe_preview_config() and EPKB_Articles_Setup: on every knowledge base article page view, when the request supplies epkb_fe_reload_mode=on, an attacker-controlled JSON blob is merged over the stored KB configuration and several values are concatenated directly into a stylesheet emitted inside a literal <style> element without escaping (minify_css() does not strip <, > or /). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user (with Editor-level access or above, holding the manage_categories capability, or an Administrator) into performing an action such as clicking on a specially crafted link.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

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

EPSS: 0.002540000 probability, percentile 0.168990000 (date 2026-10-28)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Echoplugins Echo Knowledge Base Documentation FAQs Chat Smart Search affected 17.214.0 semver Not specified

References

ReferenceSourceLinkTags
www.wordfence.com/threat-intel/vulnerabilities/id/3bfab9cf-4ccb-45fc-83ce-b5250... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/admin/edit... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/class-epkb... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/features/a... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/features/l... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/features/a... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/admin/edit... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset/3727663/echo-knowledge-base/trunk/includes/admin/ed... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: crow (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-25T17:07:53.000ZVendor Notified
CNA2026-10-27T18:45:20.000ZDisclosed

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