CVE-2026-101935 Echo Knowledge Base <= 17.214.0 - Reflected Cross-Site Scripting via 'new_kb_config' Parameter
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-101935?
CVE-2026-101935 is a medium-severity vulnerability in echoplugins Echo Knowledge Base – Documentation, FAQs, Chat & Smart Search, published on 28 Oct 2026.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-101935?
How do I fix CVE-2026-101935?
No fix has been published for CVE-2026-101935 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-101935 being exploited?
There is no known exploitation of CVE-2026-101935 in the wild and no public exploit code.
Sources
Also known as GHSA-7f9m-hhf7-j63p.