Stored XSS in Better Messages WordPress Plugin Allows Script Injection

Impact Analysis

The vulnerability allows attackers to execute arbitrary web scripts in the context of users visiting the affected pages. This can lead to theft of user credentials, session hijacking, defacement, or distribution of malware. Since the attacker does not need to be authenticated, it increases the risk of widespread exploitation.

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the Better Messages plugin for WordPress and related platforms. It occurs because the plugin does not properly sanitize and escape input from guest display names. As a result, an unauthenticated attacker can inject malicious scripts into pages, which then execute whenever a user views those pages.

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Detection Guidance

Detection of this vulnerability involves identifying stored cross-site scripting payloads in guest display names within the Better Messages plugin. You can inspect the database entries or web pages where guest names are displayed for suspicious script tags or unusual input. For example, using command-line tools like curl or wget to fetch pages and grep to search for script tags in guest names may help. However, no specific detection commands are provided in the available resources.

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Mitigation Strategies

To mitigate this vulnerability, update the Better Messages plugin to version 2.10.3 or later, where the guest display name input is sanitized using the sanitize_user() function, preventing injection of malicious scripts. This update addresses the insufficient input sanitization and output escaping that caused the vulnerability. [2]

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