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CVE-2026-14855— RT Mega Menu <= 1.5.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via rtmega_update_menu_options AJAX Action

Quick assessment

Affected
themewant RT Mega Menu – Mega Menu Builder for Elementor & Gutenberg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 RT Mega Menu 插件存在存储型跨站脚本（Stored XSS）漏洞，受影响版本为 1.5.1 及更早的所有版本。该漏洞是由于输入过滤不足和输出转义不当，通过 'css[left]' 参数触发。这使得拥有 Subscriber 级别或更高权限的已认证攻击者能够向页面中注入任意网页脚本，当用户访问被注入的页面时，这些脚本将会执行。

CVSS 6.4 · Medium EPSS 0.20% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
themewant RT Mega Menu – Mega Menu Builder for Elementor & Gutenberg ≤ 1.5.1 affected
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I. Basic Information for CVE-2026-14855

Vulnerability Information
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Vulnerability Title
RT Mega Menu <= 1.5.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via rtmega_update_menu_options AJAX Action
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
themewant RT Mega Menu – Mega Menu Builder for Elementor & Gutenberg 0 ~ 1.5.1 -

II. Public POCs for CVE-2026-14855

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III. Intelligence Information for CVE-2026-14855

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Other References for CVE-2026-14855 (4)

IV. Related Vulnerabilities

Same product: RT Mega Menu – Mega Menu Builder for Elementor & Gutenberg
Same vendor: themewant
Same weakness: CWE-79

V. Comments for CVE-2026-14855

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