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

CVE	CVE-2023-6875
State	PUBLISHED
Assigner	Wordfence
Source Priority	CVE Program / NVD first with legacy fallback
Published	2024-01-11 09:15:52 UTC
Updated	2026-04-08 19:19:01 UTC
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.

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.936150000 probability, percentile 0.998390000 (date 2026-04-22)

Problem Types: CWE-639 | CWE-862 | CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key | CWE-862 CWE-862 Missing Authorization

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	9.8	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
3.1	[email protected]	Secondary	9.8	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
3.1	CNA	DECLARED	9.8	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Type	Vendor	Product	Version	Update	Edition	Language
Application	Wpexperts	Post Smtp	All	All	All	All

Source	Vendor	Product	Version	Platforms
CNA	Saadiqbal	Post SMTP Complete Email Deliverability And SMTP Solution With Email Logs Alerts Backup SMTP Mobile App	affected 2.8.7 semver	Not specified

Reference	Source	Link	Tags
www.wordfence.com/threat-intel/vulnerabilities/id/e675d64c-cbb8-4f24-9b6f-2597a...	af854a3a-2127-422b-91ae-364da2661108	www.wordfence.com	Third Party Advisory
packetstormsecurity.com/files/176525/WordPress-POST-SMTP-Mailer-2.8.7-Authorization-B...	af854a3a-2127-422b-91ae-364da2661108	packetstormsecurity.com	Third Party Advisory, VDB Entry
plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk	af854a3a-2127-422b-91ae-364da2661108	plugins.trac.wordpress.org	Product
plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mobile/includes/rest-api/v1/r...	af854a3a-2127-422b-91ae-364da2661108	plugins.trac.wordpress.org	Issue Tracking
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

CNA: Ulyses Saicha (en)

Source	Time	Event
CNA	2024-01-10T00:00:00.000Z	Disclosed

731078 WordPress Plugin POST Simple Mail Transfer Protocol (SMTP) Authorization Bypass Vulnerability