CVE-2026-0691 CM E-Mail Blacklist <= 1.6.2 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'black_email' Parameter
Administrators can inject scripts via email blacklist parameters in multi-site or restricted HTML WordPress installations, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-0691?
CVE-2026-0691 is a medium-severity cross-site scripting vulnerability in creativemindssolutions CM E-Mail Blacklist – Simple email filtering for safer registration, published on 17 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-0691?
How do I fix CVE-2026-0691?
No fix has been published for CVE-2026-0691 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-0691 being exploited?
There is no known exploitation of CVE-2026-0691 in the wild and no public exploit code.
Sources
Also known as GHSA-h4hg-xmrj-3c6w.