{"id":"CVE-2026-101935","aliases":["EUVD-2026-111818","GHSA-7f9m-hhf7-j63p"],"status":"published","title":"Echo Knowledge Base \u003c= 17.214.0 - Reflected Cross-Site Scripting via 'new_kb_config' Parameter","description":"The Echo Knowledge Base – Documentation, FAQs, Chat \u0026 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 \u003cstyle\u003e 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 \u003cstyle\u003e element without escaping (minify_css() does not strip \u003c, \u003e 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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00254,"percentile":0.17015,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-10-28T07:48:29Z","modified":"2026-10-29T02:16:45Z","products":[{"vendor":"echoplugins","product":"echo knowledge base – documentation, faqs, chat \u0026 smart search"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/3bfab9cf-4ccb-45fc-83ce-b5250f0f6482?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/features/articles/class-epkb-articles-setup.php#L319"},{"url":"https://plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/features/articles/class-epkb-articles-setup.php#L131"},{"url":"https://plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/admin/editor/class-epkb-frontend-editor.php#L848"},{"url":"https://plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/admin/editor/class-epkb-frontend-editor.php#L1072"},{"url":"https://plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/class-epkb-utilities.php#L836"},{"url":"https://plugins.trac.wordpress.org/browser/echo-knowledge-base/tags/17.214.0/includes/features/layouts/class-epkb-layouts-setup.php#L45"},{"url":"https://plugins.trac.wordpress.org/changeset/3727663/echo-knowledge-base/trunk/includes/admin/editor/class-epkb-frontend-editor.php"},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3727647%40echo-knowledge-base%2Ftags%2F17.311.0\u0026old=3672811%40echo-knowledge-base%2Ftags%2F17.214.0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101935"},{"url":"https://github.com/advisories/GHSA-7f9m-hhf7-j63p"}],"sources":{"cve":[{"id":"CVE-2026-101935","title":"Echo Knowledge Base \u003c= 17.214.0 - Reflected Cross-Site Scripting via 'new_kb_config' Parameter","description":"The Echo Knowledge Base – Documentation, FAQs, Chat \u0026 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 \u003cstyle\u003e 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 \u003cstyle\u003e element without escaping (minify_css() does not strip \u003c, \u003e 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.","status":"published","published":"2026-10-28T07:48:29.075Z","modified":"2026-10-29T01:41:50.091Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:20:10.143031Z"}],"euvd":[{"id":"EUVD-2026-111818","description":"The Echo Knowledge Base – Documentation, FAQs, Chat \u0026 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 \u003cstyle\u003e 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 \u003cstyle\u003e element without escaping (minify_css() does not strip \u003c, \u003e 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.","status":"published","published":"2026-10-28T07:48:29Z","modified":"2026-10-29T01:41:50Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:59:18.489561Z"}],"ghsa":[{"id":"GHSA-7f9m-hhf7-j63p","title":"The Echo Knowledge Base – Documentation, FAQs, Chat \u0026 Smart Search plugin for WordPress is...","description":"The Echo Knowledge Base – Documentation, FAQs, Chat \u0026 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 \u003cstyle\u003e 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 \u003cstyle\u003e element without escaping (minify_css() does not strip \u003c, \u003e 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.","status":"published","published":"2026-10-28T09:31:56Z","modified":"2026-10-28T09:32:04Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:14:33.106751Z"}],"nvd":[{"id":"CVE-2026-101935","description":"The Echo Knowledge Base – Documentation, FAQs, Chat \u0026 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 \u003cstyle\u003e 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 \u003cstyle\u003e element without escaping (minify_css() does not strip \u003c, \u003e 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.","status":"published","published":"2026-10-28T08:16:29.567Z","modified":"2026-10-29T02:16:45.04Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:13:04.340553Z"}]}}