CVE-2022-0873 in Gmedia Photo Gallery Plugin
Summary
by MITRE • 05/16/2022
The Gmedia Photo Gallery WordPress plugin before 1.20.0 does not sanitise and escape the Album's name before outputting it in pages/posts with a media embed, which could allow high privilege users such as admin to perform Cross-Site Scripting attacks even when the unfiltered-html capability is disallowed
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Analysis
by VulDB Data Team • 05/18/2022
The vulnerability identified as CVE-2022-0873 affects the Gmedia Photo Gallery WordPress plugin version 1.20.0 and earlier, representing a critical cross-site scripting flaw that undermines web application security. This issue stems from inadequate input sanitization and output escaping mechanisms within the plugin's handling of album names, creating a persistent security weakness that can be exploited by authenticated users with administrative privileges. The vulnerability specifically manifests when album names containing malicious script content are embedded within pages or posts, allowing attackers to execute arbitrary JavaScript code in the context of other users' browsers. This flaw particularly concerns security practitioners because it enables privilege escalation through XSS attacks even when WordPress's unfiltered-html capability has been properly restricted, which is a standard security measure designed to prevent unauthorized code execution.
The technical implementation of this vulnerability involves the plugin's failure to properly sanitize user-provided album names before rendering them in HTML output contexts. When administrators create or modify album names containing script tags or malicious payloads, the plugin processes these inputs without adequate validation or escaping mechanisms. This oversight creates a direct pathway for XSS exploitation, as the unsanitized content flows directly into the browser context where it gets executed. The vulnerability is classified under CWE-79 as a Cross-Site Scripting weakness, specifically demonstrating poor output escaping practices that violate fundamental web security principles. Attackers can leverage this vulnerability by crafting album names with malicious JavaScript code, which then gets executed when the embedded media gallery displays the album information on web pages, potentially leading to session hijacking, data theft, or further privilege escalation within the WordPress environment.
The operational impact of CVE-2022-0873 extends beyond simple code execution, creating significant risks for WordPress administrators and end-users who rely on the Gmedia Photo Gallery plugin for media management. High-privilege users such as administrators who are typically protected by WordPress's security mechanisms become vulnerable when this plugin introduces XSS vectors that bypass standard protections. This vulnerability undermines the security model of WordPress installations by allowing authenticated attackers to execute malicious scripts in the context of other users, potentially leading to complete system compromise. The attack surface is particularly concerning because it operates within the context of legitimate plugin functionality, making it difficult to detect through standard security monitoring. This vulnerability aligns with ATT&CK technique T1566.001 for credential access through phishing and T1059.001 for command and scripting interpreter execution, demonstrating how a seemingly benign plugin feature can be weaponized for broader attack campaigns.
Organizations should immediately upgrade to Gmedia Photo Gallery plugin version 1.20.0 or later to remediate this vulnerability, as the update includes proper input sanitization and output escaping mechanisms. Security teams should implement additional monitoring for suspicious album name creation patterns and conduct regular security audits of installed plugins to identify similar vulnerabilities. Network administrators should consider implementing web application firewalls with XSS detection capabilities as an additional defense layer, particularly for WordPress installations that cannot immediately update the vulnerable plugin. The vulnerability also highlights the importance of validating all user inputs and implementing proper output encoding, principles that align with OWASP Top 10 security recommendations and defense-in-depth strategies. Organizations should also review their plugin management policies to ensure timely updates and maintain inventories of all installed plugins to prevent similar vulnerabilities from remaining undetected in their environments.