WordPress POST SMTP Mailer - Authorization Bypass (CVE-2023-6875)
138Exploiting IPs reported
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.
CrowdSec analysis
CVE-2023-6875 is a critical vulnerability in the POST SMTP Mailer plugin for WordPress, which allows threat actors to gain unauthorized access and modify sensitive data within WordPress installations.
CrowdSec has been tracking this vulnerability and its exploits since 1st of April 2025.
Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2023-6875 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. In addition, according to the CrowdSec network, attack volume against CVE-2023-6875 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.
Exploitation attempts commonly target URLs containing /wp-json/post-smtp/v1/connect-app.
Exploitation
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Protection
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Blocklist
With our advanced worldwide network detection, CrowdSec can provide a list of IPs known for exploiting the vulnerability.
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