---
id: "CVE-2026-101935"
kind: "vulnerability"
aliases: ["CVE-2026-101935"]
title: "Echo Knowledge Base WordPress plugin: unauthenticated script injection via config parameter"
severity: "medium"
cvss: 6.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["knowledge-base", "package", "self-hosted", "wordpress", "wordpress-plugin"]
not_affected_if: ["plugin-not-installed", "version-above-17.214.0"]
published_at: "2026-10-28T08:16:29+00:00"
first_seen_at: "2026-10-28T08:31:53+00:00"
updated_at: "2026-10-28T08:33:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101935", "first_seen_at": "2026-10-28T08:31:53+00:00"}]
---

# Echo Knowledge Base WordPress plugin: unauthenticated script injection via config parameter

The Echo Knowledge Base plugin for WordPress, up to and including 17.214.0, places attacker-supplied configuration values into a style element without escaping. An attacker can make scripts run in a logged-in user's browser on the site if that user clicks a crafted link.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Open the Plugins screen in WordPress admin and check whether Echo Knowledge Base is installed at `17.214.0` or earlier.
- Search web server access logs for requests containing `epkb_fe_reload_mode=on` and a `new_kb_config` parameter.

## Fix

- Update Echo Knowledge Base to a release newer than `17.214.0`; the sources do not name the fixed version.
- Remove the plugin if it is not needed.

## Timeline

- 2026-10-28T08:31:53+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-101935

## From the sources

The 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.

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