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CVE-2026-9643— WP Meta SEO <= 4.5.18 - Unauthenticated Stored Cross-Site Scripting via REQUEST_URI in 404 Logging

Quick assessment

Affected
joomunited WP Meta SEO
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.

joomunited wp meta seo是joomunited公司开源的一个网站SEO优化插件。 joomunited wp meta seo 4.5.18及之前版本存在跨站脚本漏洞，该漏洞源于通过REQUEST_URI服务器变量注入任意Web脚本，可能导致未经验证的攻击者在管理员查看404与重定向管理页面时执行存储型跨站脚本攻击。

CVSS 7.2 · High EPSS 0.42% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
joomunited WP Meta SEO ≤ 4.5.18 affected
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I. Basic Information for CVE-2026-9643

Vulnerability Information
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Vulnerability Title
WP Meta SEO <= 4.5.18 - Unauthenticated Stored Cross-Site Scripting via REQUEST_URI in 404 Logging
Source: CVE Program / CVE List V5
Vulnerability Description
The WP Meta SEO plugin for WordPress is vulnerable to Unauthenticated Stored Cross-Site Scripting via the REQUEST_URI server variable in all versions up to, and including, 4.5.18. When the plugin's `wpmsTemplateRedirect()` hook detects a 404, it concatenates `$_SERVER['HTTP_HOST']` with the raw `$_SERVER['REQUEST_URI']` and inserts that value verbatim into the `wp_wpms_links.link_url` column via `$wpdb->insert()`. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute whenever an administrator views the plugin's 404 & Redirects admin page (`/wp-admin/admin.php?page=metaseo_broken_link`).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
joomunited wp meta seo 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
joomunited wp meta seo是joomunited公司开源的一个网站SEO优化插件。 joomunited wp meta seo 4.5.18及之前版本存在跨站脚本漏洞，该漏洞源于通过REQUEST_URI服务器变量注入任意Web脚本，可能导致未经验证的攻击者在管理员查看404与重定向管理页面时执行存储型跨站脚本攻击。
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
joomunited WP Meta SEO 0 ~ 4.5.18 -

II. Public POCs for CVE-2026-9643

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III. Intelligence Information for CVE-2026-9643

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Patches & Fixes for CVE-2026-9643 (1)

Vendor Advisories for CVE-2026-9643 (1)

Same Patch Batch · joomunited · 2026-06-24 · 3 CVEs total

CVE-2026-11370 6.4 MEDIUM WP Meta SEO <= 4.5.18 - Authenticated (Contributor+) Server-Side Request Forgery via 'new_
CVE-2026-9620 6.4 MEDIUM WP Latest Posts <= 5.0.11 - Authenticated (Author+) Stored Cross-Site Scripting via Post C

IV. Related Vulnerabilities

Same product: WP Meta SEO
Same vendor: joomunited
Same weakness: CWE-79

V. Comments for CVE-2026-9643

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