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CVE-2026-18400— Slider, Gallery, and Carousel by MetaSlider <= 3.111.0 - Authenticated (Author+) Stored Cross-Site Scripting via 'delay' Post Meta Setting

Quick assessment

Affected
metaslider Slider, Gallery, and Carousel by MetaSlider – Image Slider, Video Slider
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 MetaSlider是WordPress基金会开源的一款创建幻灯片展示的CMS插件。 WordPress MetaSlider 3.111.0及之前版本存在跨站脚本漏洞，该漏洞源于'delay' Post Meta Setting的输入清理和输出转义不足，且ml-slider自定义文章类型注册无自定义功能限制、ml-slider_settings meta key未受保护，导致经过身份验证的攻击者（具有custom-level及以上权限）可注入任意Web脚本，在用户访问被注入页面时执行

CVSS 6.4 · Medium EPSS 0.43% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
metaslider Slider, Gallery, and Carousel by MetaSlider – Image Slider, Video Slider ≤ 3.111.0 affected
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I. Basic Information for CVE-2026-18400

Vulnerability Information
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Vulnerability Title
Slider, Gallery, and Carousel by MetaSlider <= 3.111.0 - Authenticated (Author+) Stored Cross-Site Scripting via 'delay' Post Meta Setting
Source: CVE Program / CVE List V5
Vulnerability Description
The Slider, Gallery, and Carousel by MetaSlider – Image Slider, Video Slider plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'delay' Post Meta Setting in all versions up to, and including, 3.111.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with custom-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The ml-slider custom post type is registered without custom capability restrictions and the ml-slider_settings meta key is unprotected, allowing Author-level users to set the malicious delay value via XML-RPC custom_fields when creating an ml-slider post.
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
Vulnerability Title
WordPress MetaSlider 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress MetaSlider是WordPress基金会开源的一款创建幻灯片展示的CMS插件。 WordPress MetaSlider 3.111.0及之前版本存在跨站脚本漏洞，该漏洞源于'delay' Post Meta Setting的输入清理和输出转义不足，且ml-slider自定义文章类型注册无自定义功能限制、ml-slider_settings meta key未受保护，导致经过身份验证的攻击者（具有custom-level及以上权限）可注入任意Web脚本，在用户访问被注入页面时执行
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
metaslider Slider, Gallery, and Carousel by MetaSlider – Image Slider, Video Slider 0 ~ 3.111.0 -

II. Public POCs for CVE-2026-18400

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III. Intelligence Information for CVE-2026-18400

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Patches & Fixes for CVE-2026-18400 (1)

Vendor Advisories for CVE-2026-18400 (1)

IV. Related Vulnerabilities

Same product: Slider, Gallery, and Carousel by MetaSlider – Image Slider, Video Slider
Same vendor: metaslider
Same weakness: CWE-79