CVE-2023-6875: The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to unauthorized access of data and modification of data due to a ty

critical Affects post-smtp (WordPress plugin). Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to unauthorized access of data and modification of data due to a ty

Package
post-smtp (WordPress plugin) WordPress
Affected versions
<=2.8.7
Fixed in
no fix recorded
Severity
critical  CVSS 9.8
Exploitation
not on CISA KEV · EPSS 90% (99.8th percentile)
Published
2024-01-11
Source
nvd

References

CWE-639CWE-862
NVD recordpost-smtp (WordPress plugin) advisories

Am I affected?

Find out in one command. phpwarden checks your WordPress install against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# one-time install
pip install phpwarden

# then
phpwarden wordpress /var/www/html

Or keep it checked automatically with the GitHub Action or a nightly cron; see WordPress docs.

Install docs   How findings are ranked

Related advisories