Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/cm-email-blacklist/tags/1.6.2/backend
- https://plugins.trac.wordpress.org/browser/cm-email-blacklist/trunk/backend/view
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old
- https://www.wordfence.com/threat-intel/vulnerabilities/id/821f4ea9-bc25-4d65-905
FAQ
What is CVE-2026-0691?
CVE-2026-0691 is a vulnerability with a CVSS score of 4.4 (MEDIUM). 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 inc...
How severe is CVE-2026-0691?
CVE-2026-0691 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-0691?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.