CVE-2026-14855
MediumCVSS 6.4Summary
The RT Mega Menu plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'css[left]' parameter in all versions up to, and including, 1.5.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Risk Assessment
The risk includes execution of malicious scripts in users' browsers, potentially leading to session theft, account takeover, or malware propagation. The attack requires authentication but at a very low privilege level (subscriber).
Recommendation
Upgrade the RT Mega Menu plugin to a version newer than 1.5.1 that includes input sanitization and output escaping fixes.
Other vulnerabilities in RT Mega Menu
See all- CVE-2026-15650Medium
The RT Mega Menu – Mega Menu Builder for Elementor & Gutenberg plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'pointer_menu_item' Block Attribute in all versions up to, and including, 1.5.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses wp_kses_post filtering applied to post content on save because it contains no HTML tags and survives intact inside the block comment's JSON attributes, reaching the walker unescaped at render time.
- CVE-2026-15385Medium
The RT Mega Menu WordPress plugin before version 1.5.2 does not perform a capability check on the AJAX action that saves mega-menu configuration and per-menu-item settings. Its only gate is a nonce that any logged-in user can read from a standard admin page. A subscriber-level user can enable the mega menu on a site menu and store a menu-item style value that is rendered, without output escaping, into a style attribute on the public navigation. By breaking out of that attribute, the user persists a JavaScript event handler that executes for every visitor who hovers the navigation, including administrators, leading to session/site takeover.
Original NVD description (English source)
The RT Mega Menu plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'css[left]' parameter in all versions up to, and including, 1.5.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.