CVE-2025-22800 in Post SMTP Plugin
Summary
by MITRE • 01/13/2025
Missing Authorization vulnerability in Post SMTP Post SMTP allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Post SMTP: from n/a through 2.9.11.
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Analysis
by VulDB Data Team • 06/04/2025
The CVE-2025-22800 vulnerability represents a critical authorization flaw within the Post SMTP plugin ecosystem that undermines the fundamental security controls designed to protect email delivery configurations. This vulnerability manifests as an improperly configured access control mechanism that allows unauthorized users to exploit the plugin's administrative functions without proper authentication. The issue affects all versions of Post SMTP from the initial release through version 2.9.11, indicating a long-standing security gap that has persisted across multiple iterations of the software. The vulnerability specifically targets the plugin's security model where access control checks are either absent or incorrectly implemented, creating a pathway for malicious actors to bypass normal authorization procedures. This type of flaw directly violates the principle of least privilege and demonstrates a failure in the plugin's security architecture to properly validate user permissions before granting access to sensitive administrative functions.
The technical implementation of this vulnerability stems from the plugin's failure to properly enforce access control checks when processing administrative requests. When users attempt to perform privileged operations such as configuring email settings, managing authentication credentials, or modifying delivery parameters, the system should verify that the requesting user possesses appropriate authorization levels. However, in the affected versions, these validation checks are either completely absent or contain logic flaws that allow any authenticated user to escalate their privileges or access restricted functionality. This misconfiguration creates a scenario where users with minimal permissions can potentially perform actions typically restricted to administrators or privileged users. The vulnerability operates at the application layer and can be exploited through direct manipulation of API endpoints or web forms that handle administrative tasks, making it particularly dangerous as it requires minimal technical expertise to exploit.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data compromise and system integrity violations. Attackers who successfully exploit this flaw can gain access to sensitive email configuration details including SMTP server credentials, authentication tokens, and recipient lists that may contain confidential information. The vulnerability also opens the door for more severe attacks such as email spoofing, where malicious actors can manipulate the email delivery system to send fraudulent messages, or privilege escalation attacks that could allow full administrative control over the affected WordPress installation. Additionally, this vulnerability can be leveraged as a stepping stone for broader attacks within the compromised environment, particularly in scenarios where the WordPress site serves as a component of larger enterprise email infrastructure. The persistence of this vulnerability across multiple versions suggests that the security controls were fundamentally flawed rather than being isolated implementation errors.
Security mitigations for this vulnerability should focus on immediate remediation through plugin updates to versions that properly implement access control validation. System administrators must ensure that all affected installations are updated to the latest available version that addresses the authorization flaw. The implementation of additional security measures including network segmentation, web application firewalls, and monitoring of administrative access patterns can provide defense-in-depth protection. Organizations should also conduct comprehensive security assessments to identify any potential exploitation that may have occurred prior to the patch deployment. The vulnerability aligns with CWE-285, which addresses improper authorization issues in software systems, and can be categorized under ATT&CK technique T1078 for valid accounts and T1566 for phishing attacks that may exploit this weakness. Regular security audits and proper access control configuration reviews should be implemented to prevent similar issues from emerging in other security controls within the WordPress ecosystem or related applications.