CVE-2022-36282 in Search Exclude Plugin
Summary
by MITRE • 08/23/2022
Authenticated (editor+) Stored Cross-Site Scripting (XSS) vulnerability in Roman Pronskiy's Search Exclude plugin <= 1.2.6 at WordPress.
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Analysis
by VulDB Data Team • 09/25/2022
This vulnerability exists within the Search Exclude plugin for WordPress, specifically affecting versions up to and including 1.2.6. The issue manifests as a stored cross-site scripting flaw that requires an authenticated user with editor privileges or higher to exploit. The vulnerability stems from insufficient input sanitization and output escaping mechanisms within the plugin's administrative interface where users can configure search exclusion settings. Attackers with editor-level access can inject malicious javascript code into the plugin's configuration parameters, which then gets stored in the database and executed whenever the affected page is loaded by any user with sufficient privileges to view the plugin settings.
The technical implementation of this flaw involves the plugin failing to properly sanitize user-supplied input before rendering it within HTML output contexts. When administrators configure exclusion rules or modify plugin settings through the WordPress admin panel, the input data flows directly into the HTML without appropriate encoding or validation. This creates a classic stored XSS vector where malicious scripts persist in the database and execute in the context of other users' browsers. The vulnerability is particularly concerning because it requires only editor-level privileges, which are commonly granted to content creators and contributors in WordPress installations, making it accessible to a broad range of authenticated users.
From an operational impact perspective, this vulnerability enables attackers to execute arbitrary javascript code in the browsers of other administrators or editors who view the plugin's configuration pages. The attack surface expands significantly as the malicious scripts can leverage the elevated privileges of the victim users to perform actions such as modifying content, accessing sensitive data, or even creating new admin accounts. The stored nature of the vulnerability means that the malicious payload persists even after the initial injection, allowing for long-term exploitation and making detection more challenging. This type of vulnerability can facilitate further attacks including session hijacking, privilege escalation, or data exfiltration from the compromised WordPress installation.
The vulnerability aligns with CWE-79 which categorizes cross-site scripting flaws as weaknesses in input validation and output encoding. It also maps to ATT&CK technique T1059.007 for command and scripting interpreter usage, as the stored scripts can be used to execute arbitrary commands or establish persistence. Mitigation strategies include immediate patching to version 1.2.7 or later, which contains the necessary input sanitization fixes. Administrators should also implement strict role-based access controls to limit who can access plugin configuration interfaces, and consider implementing content security policies to reduce the impact of potential XSS exploitation. Regular security audits of installed plugins and maintaining up-to-date WordPress core and plugin versions remain essential defensive measures against similar vulnerabilities in the WordPress ecosystem.