MW WP Form <= 5.1.3 — Authenticated (Editor+) Stored Cross-Site Scripting via 'memo' Parameter
CVE-2026-8853Published · Updated Action summary
Affected: ≤5.1.3Update to 5.1.4 or newer
All remediation steps- Severity
- Medium4.4
- CVSS
- 4.4CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:HAttack complexity- High
PR:HPrivileges required- High
UI:NUser interaction- None
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
MW WP Form mw-wp-form
- Affected≤ 5.1.3
- Patched in5.1.4
Update to 5.1.4 or newer.
You are affected if you run ≤ 5.1.3. Version 5.1.4 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under MW WP Form.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 5.1.4, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch MW WP Form to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Sérgio Charruadas (itzvenom).
The MW WP Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'memo' parameter in all versions up to, and including, 5.1.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Because the memo value is stored via update_post_meta() rather than wp_insert_post(), WordPress's built-in kses and unfiltered_html protections do not apply, allowing attackers to break out of the textarea element via injected closing tags regardless of role-based content filtering.
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 MW WP Form
All 14| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'post_id' Parameter ≤5.1.7Update to 5.1.8 | CVE-2026-92086 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting via 'post_id' Parameter (via stored form-submitted post meta) ≤5.1.7Update to 5.1.8 | CVE-2026-96567 | |
| Medium4.4 | Authenticated (Editor+) Stored Cross-Site Scripting <5.1.6Update to 5.1.6 | CVE-2026-78364 | |
| Medium6.5 | Unauthenticated Arbitrary Shortcode Execution <5.1.5Update to 5.1.5 | CVE-2026-78363 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤5.1.3Update to 5.1.4 | CVE-2026-48871 |
- Medium5.3Unauthenticated Sensitive Information Exposure in 'post_id' Parameter
≤5.1.7Update to 5.1.8
- High7.2Unauthenticated Stored Cross-Site Scripting via 'post_id' Parameter (via stored form-submitted post meta)
≤5.1.7Update to 5.1.8
- Medium4.4Authenticated (Editor+) Stored Cross-Site Scripting
<5.1.6Update to 5.1.6
- Medium6.5Unauthenticated Arbitrary Shortcode Execution
<5.1.5Update to 5.1.5
- High7.2Unauthenticated Stored Cross-Site Scripting
≤5.1.3Update to 5.1.4
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 medium, CVSS 4.4
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. 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.