CM E-Mail Blacklist Plugin up to 1.6.2 on WordPress black_email cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in CM E-Mail Blacklist Plugin up to 1.6.2 on WordPress. Affected by this vulnerability is an unknown functionality. The manipulation of the argument black_email leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-0691. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in CM E-Mail Blacklist Plugin up to 1.6.2 on WordPress and classified as problematic. This issue affects some unknown processing. The manipulation of the argument black_email with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

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.

It is possible to read the advisory at wordfence.com. The identification of this vulnerability is CVE-2026-0691. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-3144). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• WordPress Plugin

Name

• CM E-Mail Blacklist Plugin

Version

• 1.6.0
• 1.6.1
• 1.6.2

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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