PT-2026-3350 · WordPress · Cm E-Mail Blacklist

Phap Nguyen Anh · Published 2026-01-17 · Updated 2026-01-17 · CVE-2026-0691

Positive Technologies (AI Summary)

CVSS v3.1

4.4

Medium

Base vector

AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions CM E-Mail Blacklist versions prior to 1.6.3

Description The CM E-Mail Blacklist WordPress plugin is susceptible to Stored Cross-Site Scripting through the black email parameter. Insufficient input sanitization and output escaping allow authenticated attackers with administrator-level access or higher to inject arbitrary web scripts into pages. These scripts will execute when a user accesses the injected page. This issue only impacts multi-site installations and those where unfiltered html has been disabled.

Recommendations Update CM E-Mail Blacklist to version 1.6.3 or later.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-0691

Affected Products

Cm E-Mail Blacklist

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-0691 · Security Note
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3440158%40cm-email-blacklist&new=3440158%40cm-email-blacklist&sfp_email=&sfph_mail= · Note
• https://twitter.com/CVEnew/status/2012490344781283681 · Twitter Post
• https://plugins.trac.wordpress.org/browser/cm-email-blacklist/trunk/backend/views/settings/email_blacklist.phtml#L67 · Note
• https://plugins.trac.wordpress.org/browser/cm-email-blacklist/tags/1.6.2/backend/views/settings/email_blacklist.phtml#L67 · Note
• https://twitter.com/VulmonFeeds/status/2012458446667370990 · Twitter Post
• https://wordfence.com/threat-intel/vulnerabilities/id/821f4ea9-bc25-4d65-9058-5b77c4f1b230?source=cve · Note