CM E-Mail Blacklist <= 1.6.2 — Authenticated (Administrator+) Stored Cross-Site Scripting via 'black_email' Parameter
CVE-2026-0691Published · Updated Action summary
Affected: ≤1.6.2Update to 1.6.3 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?
CM E-Mail Blacklist – Simple email filtering for safer registration cm-email-blacklist
- Affected≤ 1.6.2
- Patched in1.6.3
Update to 1.6.3 or newer.
You are affected if you run ≤ 1.6.2. Version 1.6.3 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under CM E-Mail Blacklist – Simple email filtering for safer registration.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 1.6.3, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch CM E-Mail Blacklist – Simple email filtering for safer registration to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Phap Nguyen Anh.
The CM E-Mail Blacklist – Simple email filtering for safer registration plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'black_email' parameter in all versions up to, and including, 1.6.2. This is due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
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 CM E-Mail Blacklist – Simple email filtering for safer registration
All 4| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.1 | Reflected Cross-Site Scripting ≤1.5.5Update to 1.5.6 | CVE-2025-24694 | |
| Medium6.1 | Reflected Cross-Site Scripting via cminds_free_guide Shortcode ≤1.4.2Update to 1.4.3 | CVE-2024-11202 | |
| Medium4.3 | Cross-Site Request Forgery ≤1.4.8Update to 1.4.9 | CVE-2024-5167 |
- Medium6.1Reflected Cross-Site Scripting
≤1.5.5Update to 1.5.6
- Medium6.1Reflected Cross-Site Scripting via cminds_free_guide Shortcode
≤1.4.2Update to 1.4.3
- Medium4.3Cross-Site Request Forgery
≤1.4.8Update to 1.4.9
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.