WP Meta SEO <= 4.5.18 — Unauthenticated Stored Cross-Site Scripting via REQUEST_URI in 404 Logging
CVE-2026-9643Published · Updated Action summary
Affected: ≤4.5.18No patch available
What to do until a fix ships- Severity
- High7.2
- CVSS
- 7.2CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
WP Meta SEO wp-meta-seo
- Affected≤ 4.5.18
- PatchedNo fix yet
No patched version available.
You are affected if you run ≤ 4.5.18. No fixed version has been released.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under WP Meta SEO.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch WP Meta SEO to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to zedeq.
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`).
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in WP Meta SEO
All 18| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.4 | Authenticated (Contributor+) Server-Side Request Forgery via 'new_link' Parameter ≤4.5.18No patch available | CVE-2026-11370 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤4.5.13Update to 4.5.14 | CVE-2024-45456 | |
| Medium4.4 | Authenticated (Administrator+) Stored Cross-Site Scripting ≤4.5.13Update to 4.5.14 | CVE-2024-45455 | |
| Medium5.3 | Information Exposure via Meta Description ≤4.5.12Update to 4.5.13 | CVE-2023-6962 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Referer header ≤4.5.12Update to 4.5.13 | CVE-2023-6961 |
- Medium6.4Authenticated (Contributor+) Server-Side Request Forgery via 'new_link' Parameter
≤4.5.18No patch available
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤4.5.13Update to 4.5.14
- Medium4.4Authenticated (Administrator+) Stored Cross-Site Scripting
≤4.5.13Update to 4.5.14
- Medium5.3Information Exposure via Meta Description
≤4.5.12Update to 4.5.13
- High7.2Unauthenticated Stored Cross-Site Scripting via Referer header
≤4.5.12Update to 4.5.13
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity high, CVSS 7.2
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.