XSS in Joomunited Wp Meta Seo
CVE-2026-9643
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`).
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Joomunited Wp Meta Seo — versions 0
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/beceb218-34bf-4571-a07b-939ab…
- plugins.trac.wordpress.org/browser/wp-meta-seo/tags/4.5.18/inc/class.metaseo-br…
- plugins.trac.wordpress.org/browser/wp-meta-seo/tags/4.5.18/wp-meta-seo.php
- plugins.trac.wordpress.org/browser/wp-meta-seo/tags/4.5.18/wp-meta-seo.php
- plugins.trac.wordpress.org/changeset
- ti.wordfence.io/vulnerabilities/ca91e41d-b728-4eb0-86d5-043813d8c2c1
Frequently asked questions
- What is CVE-2026-9643?
- CVE-2026-9643 is a high-severity vulnerability in Joomunited Wp Meta Seo, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-06-24.
- How severe is CVE-2026-9643?
- High severity. CVSS v3 base score is 7.2 out of 10.