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CVE-2026-109983— YMC Filter <= 3.12.19 - Authenticated (Author+) Stored DOM-Based Cross-Site Scripting via 'post_title' Parameter

Quick assessment

Affected
wssoffice21 YMC Filter
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 YMC Filter 插件在所有 3.12.19 及更早版本中，由于输入净化和输出转义不足，存在存储型基于 DOM 的跨站脚本（Stored DOM-Based XSS）漏洞。该漏洞允许拥有作者（Author）及以上权限的已认证攻击者，在页面中注入任意 Web 脚本；当用户访问被注入的页面时，这些脚本将被执行。此外，该插件的自动补全 REST 接口注册了一个权限回调函数，该回调无条件返回 true，这意味着任何站点访客（包括未认证用户）只需在 YMC 过滤器搜索框中输入内容即可触发攻击载荷，

CVSS 6.4 · Medium
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I. Basic Information for CVE-2026-109983

Vulnerability Information
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Vulnerability Title
YMC Filter <= 3.12.19 - Authenticated (Author+) Stored DOM-Based Cross-Site Scripting via 'post_title' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The YMC Filter plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'post_title' parameter in all versions up to, and including, 3.12.19 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The autocomplete REST endpoint is registered with a permission callback that unconditionally returns true, meaning any site visitor — including unauthenticated users — can trigger the payload simply by typing in the YMC filter search box, while only Author-level access is required to store it.
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
wssoffice21 YMC Filter 0 ~ 3.12.19 -

II. Public POCs for CVE-2026-109983

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III. Intelligence Information for CVE-2026-109983

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Vendor Pages for CVE-2026-109983 (5)

Other References for CVE-2026-109983 (2)

IV. Related Vulnerabilities

Same product: YMC Filter
Same vendor: wssoffice21
Same weakness: CWE-79

V. Comments for CVE-2026-109983

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