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CVE-2023-6875

POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress <= 2.8.7 - Authorization Bypass via type connect-app API

Published: Jan 11, 2024Updated: Jun 4, 2025 Sources: CVE List NVD BDUCWE-862
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
90.3%
Top 0.2%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
Patch Available
Am I actually vulnerable?2 Nuclei templates available — see how to check your systems. How to verify

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-862

Affected Products

POST SMTP MailerWordPress FoundationWeb & CMS Plugins
post smtpwpexperts
On-prem
Web & CMS Plugins / wordpress-plugin
Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile Appsaadiqbal
Mixed
Web & CMS Plugins / wordpress-plugin
wordpress foundationoss-projectUSWeb & CMS Plugins
wpexpertscommercialWeb & CMS Pluginsaka wpexperts wp plugins, post smtp, mycred, wp multi store locator
saadiqbalindividual-devWeb & CMS Pluginsaka post smtp – complete email deliverability and smtp solution with email logs, alerts, backup smtp & mobile app, advanced file manager – ultimate file manager for wordpress and document library solution, points management system for gamification, ranks, badges, and loyalty rewards program – mycred

Attack Graph

Products CVE Techniques Tactics

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Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

http://packetstormsecurity.com/files/176525/WordPress-POST-SMTP-Mailer-2.8.7-Authorization-Bypass-Cross-Site-Scripting.html&#13;
packetstormsecurity.com
https://plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mobile/includes/rest-api/v1/rest-api.php#L60&#13;
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk?contextall=1&amp;old=3012318&amp;old_path=%2Fpost-smtp%2Ftrunk&#13;
plugins.trac.wordpress.org
and 8 more references View all →

Timeline

Published
Jan 11, 2024
Last Updated
Jun 4, 2025

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