CVE-2023-3081 in WP Mail Logging Plugin
Summary
by MITRE • 07/12/2023
The WP Mail Logging plugin for WordPress is vulnerable to Stored Cross-Site Scripting via email contents in versions up to, and including, 1.11.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Note: An incomplete fix was released in 1.11.1.
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Analysis
by VulDB Data Team • 04/10/2026
The WP Mail Logging plugin for WordPress represents a critical security vulnerability classified as CVE-2023-3081, affecting versions up to and including 1.11.1. This vulnerability manifests as a stored cross-site scripting flaw that specifically targets the plugin's handling of email contents within the WordPress environment. The issue arises from inadequate input sanitization mechanisms and insufficient output escaping practices that fail to properly validate and sanitize user-supplied data before it is stored and subsequently rendered in web pages. The vulnerability exists within the plugin's email logging functionality where email messages are captured, stored, and displayed to users who access the logging interface. Attackers can exploit this weakness by crafting malicious email content containing embedded scripts that will execute whenever any user accesses the affected pages containing the stored malicious payloads.
The technical implementation of this vulnerability stems from the plugin's failure to properly sanitize email content before storing it in the database and rendering it on web pages. When email messages are logged, the plugin does not adequately filter or escape potentially dangerous characters and script tags that could be embedded within the email content. This allows attackers to inject malicious javascript code, html tags, or other harmful content that gets stored in the plugin's database and executed in the context of any user's browser who views the logged email content. The vulnerability is particularly concerning because it operates as a stored XSS attack rather than a reflected one, meaning the malicious payload persists in the system and affects multiple users over time. The incomplete fix released in version 1.11.1 demonstrates that the developers failed to fully address the root cause of the sanitization issues, leaving the system vulnerable to exploitation.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with a potential foothold for more sophisticated attacks within the WordPress environment. An unauthenticated attacker can leverage this vulnerability to execute arbitrary scripts in the context of authenticated users' browsers, potentially leading to session hijacking, privilege escalation, or data exfiltration. The attack vector becomes particularly dangerous when considering that WordPress administrators or other privileged users regularly access email logging interfaces to monitor system communications. If an attacker successfully injects malicious code into email logs, any user who accesses those logs will unknowingly execute the attacker's payload, potentially compromising their sessions and system access. This vulnerability directly aligns with CWE-79, which describes cross-site scripting flaws resulting from insufficient input validation and output escaping. The attack pattern follows typical XSS exploitation methods outlined in the MITRE ATT&CK framework under the technique T1059.007 for script execution, specifically targeting web application interfaces where user-supplied content is rendered without proper sanitization.
Mitigation strategies for this vulnerability require immediate action from WordPress administrators to address the root cause through comprehensive input validation and output escaping mechanisms. The primary solution involves updating to a patched version of the WP Mail Logging plugin that properly implements sanitization routines for all user-supplied email content before storage and rendering. Organizations should implement additional defensive measures including web application firewalls that can detect and block suspicious script patterns in email content, regular monitoring of email logging interfaces for unauthorized modifications, and comprehensive security audits of all installed WordPress plugins. Security teams should also consider implementing content security policies that restrict script execution within the plugin's interface and establish monitoring protocols to detect unauthorized access to email logging functionality. The vulnerability highlights the importance of proper input validation as emphasized in OWASP Top Ten security practices and underscores the need for robust output escaping mechanisms to prevent XSS attacks. Regular security assessments of WordPress plugins should include verification of sanitization practices and testing for stored XSS vulnerabilities in all user-facing data handling components.