CVE-2023-6875

CRITICAL EXPLOITED NUCLEI

Wordpress POST SMTP Account Takeover

Title source: metasploit
STIX 2.1

Exploitation Summary

CVE-2023-6875 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 4 public exploits from researchers including UlyssesSaicha, gbrsh, hatlesswizard, including a Metasploit module auxiliary/admin/http/wp_post_smtp_acct_takeover. A Nuclei detection template is also available.

AI-analyzed exploit summary This PoC demonstrates an authentication bypass vulnerability in the Post SMTP plugin for WordPress, allowing unauthorized access to email logs and sensitive information via crafted FCM token headers.

Description

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 type juggling issue on the connect-app REST endpoint in all versions up to, and including, 2.8.7. This makes it possible for unauthenticated attackers to reset the API key used to authenticate to the mailer and view logs, including password reset emails, allowing site takeover. CVE-2023-52233 appears to be a duplicate of this issue.

Exploits (4)

nomisec WORKING POC 25 stars
by UlyssesSaicha · remote
https://github.com/UlyssesSaicha/CVE-2023-6875

This PoC demonstrates an authentication bypass vulnerability in the Post SMTP plugin for WordPress, allowing unauthorized access to email logs and sensitive information via crafted FCM token headers.

Classification
Working Poc 95%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Post SMTP plugin for WordPress (version not specified)
No auth needed
Prerequisites: WordPress with Post SMTP plugin installed · Network access to the target
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC 6 stars
by gbrsh · remote
https://github.com/gbrsh/CVE-2023-6875

This repository contains a functional exploit for CVE-2023-6875, which targets PostSMTP Mailer for unauthorized account takeover. The exploit leverages a vulnerability in the plugin to steal password reset keys and change user passwords.

Classification
Working Poc 95%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: PostSMTP Mailer (versions before 2.8.8)
No auth needed
Prerequisites: Target must have PostSMTP Mailer plugin installed and vulnerable version · WordPress site must be accessible
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC 1 stars
by hatlesswizard · remote
https://github.com/hatlesswizard/CVE-2023-6875

This Go-based exploit targets a WordPress plugin vulnerability (CVE-2023-6875) by abusing the Post SMTP plugin's API to intercept password reset emails, extract the reset link, and upload a malicious shell. It automates the entire attack chain from token placement to admin login.

Classification
Working Poc 95%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: WordPress with Post SMTP plugin
No auth needed
Prerequisites: WordPress site with vulnerable Post SMTP plugin · Network access to target
devstral-2 · analyzed Feb 18, 2026 Full analysis →
metasploit WORKING POC
by h00die, Ulysses Saicha · rubypoc
https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/admin/http/wp_post_smtp_acct_takeover.rb

This Metasploit module exploits CVE-2023-6875, a privilege escalation vulnerability in the WordPress POST SMTP plugin prior to 2.8.7. It allows an unauthenticated attacker to reset the password of an arbitrary user by leveraging password reset functionality and accessing email logs.

Classification
Working Poc 100%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: WordPress POST SMTP plugin < 2.8.7
No auth needed
Prerequisites: WordPress installation with vulnerable POST SMTP plugin · Network access to the target
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Nuclei Templates (1)

WordPress POST SMTP Mailer <= 2.8.7 - Authorization Bypass
CRITICALVERIFIEDby iamnoooob,rootxharsh,pdresearch
Shodan: http.html:/wp-content/plugins/post-smtp
FOFA: body=/wp-content/plugins/post-smtp

Scores

CVSS v3 9.8
EPSS 0.9368
EPSS Percentile 99.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

VulnCheck KEV 2024-01-10
CWE
CWE-639 CWE-862
Status published
Products (2)
saadiqbal/Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App < 2.8.7
wpexperts/post_smtp < 2.8.7
Published Jan 11, 2024
Tracked Since Feb 18, 2026