EchoPlugins Echo Knowledge Base Plugin up to 17.214.0 on WordPress Configuration Preview fe_preview_config new_kb_config cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in EchoPlugins Echo Knowledge Base Plugin up to 17.214.0. This vulnerability affects the function EPKB_Frontend_Editor::fe_preview_config of the component Configuration Preview. The manipulation of the argument new_kb_config results in cross site scripting. This vulnerability is reported as CVE-2026-101935. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in EchoPlugins Echo Knowledge Base Plugin up to 17.214.0. Affected is the function EPKB_Frontend_Editor::fe_preview_config of the component Configuration Preview. The manipulation of the argument new_kb_config with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is available at wordfence.com. This vulnerability is traded as CVE-2026-101935 since 09/28/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• EchoPlugins

Name

• Echo Knowledge Base Plugin

Version

• 17.214

CPE 2.3info

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CPE 2.2info

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