joomunited WP Meta SEO Plugin up to 4.5.18 on WordPress /wp-admin/admin.php wpmsTemplateRedirect HTTP_HOST cross site scripting

Summaryinfo

A vulnerability labeled as problematic has been found in joomunited WP Meta SEO Plugin up to 4.5.18 on WordPress. Affected is the function wpmsTemplateRedirect of the file /wp-admin/admin.php. The manipulation of the argument HTTP_HOST results in cross site scripting. This vulnerability is reported as CVE-2026-9643. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in joomunited WP Meta SEO Plugin up to 4.5.18 on WordPress. Affected is the function wpmsTemplateRedirect of the file /wp-admin/admin.php. The manipulation of the argument HTTP_HOST with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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`).

The weakness was disclosed by Melquisedeq Ortiz. The advisory is shared for download at wordfence.com. This vulnerability is traded as CVE-2026-9643 since 05/26/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

By approaching the search of inurl:wp-admin/admin.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 4.5.18 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• joomunited

Name

• WP Meta SEO Plugin

Version

• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3
• 4.5.4
• 4.5.5
• 4.5.6
• 4.5.7
• 4.5.8
• 4.5.9
• 4.5.10
• 4.5.11
• 4.5.12
• 4.5.13
• 4.5.14
• 4.5.15
• 4.5.16
• 4.5.17
• 4.5.18

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Entryinfo

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