CVE-2023-0489 in SlideOnline Plugin
Summary
by MITRE • 06/19/2023
The SlideOnline WordPress plugin through 1.2.1 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks
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Analysis
by VulDB Data Team • 06/21/2023
The CVE-2023-0489 vulnerability resides within the SlideOnline WordPress plugin version 1.2.1 and earlier, representing a critical stored cross-site scripting flaw that undermines web application security. This vulnerability specifically affects the plugin's handling of shortcode attributes, where insufficient input validation and output escaping mechanisms leave the system susceptible to malicious code injection. The flaw is particularly concerning because it targets users with the contributor role and above, who possess sufficient privileges to create and modify content within WordPress environments, thereby expanding the potential attack surface significantly.
The technical nature of this vulnerability stems from the plugin's failure to properly sanitize shortcode parameters before rendering them within web pages. When administrators or contributors embed SlideOnline shortcodes within posts or pages, the plugin processes these attributes without adequate validation, allowing malicious actors to inject harmful scripts that persist in the database. This stored XSS condition means that the injected code executes every time the affected page is loaded, potentially compromising user sessions, stealing sensitive data, or redirecting visitors to malicious sites. The vulnerability directly maps to CWE-79, which categorizes cross-site scripting flaws as weaknesses in input validation and output escaping mechanisms.
The operational impact of CVE-2023-0489 extends beyond simple script execution, as it enables attackers to manipulate the entire WordPress environment through compromised content management capabilities. Attackers can leverage this vulnerability to escalate privileges, modify content, or establish persistent backdoors within the affected WordPress installations. The stored nature of the vulnerability means that victims need not actively interact with malicious content for exploitation to occur, as the malicious scripts execute automatically upon page load. This characteristic aligns with ATT&CK technique T1566.001, which describes the use of malicious content to gain initial access through social engineering.
Mitigation strategies for this vulnerability require immediate action from WordPress administrators, beginning with updating the SlideOnline plugin to version 1.2.2 or later, which contains the necessary security patches. Additionally, implementing proper input validation and output escaping mechanisms within the plugin code is essential for preventing similar issues in future developments. Security measures should include restricting contributor privileges where possible, implementing content security policies, and conducting regular security audits of installed plugins. The vulnerability demonstrates the importance of following secure coding practices as outlined in OWASP Top Ten and the principle of least privilege in WordPress environments. Organizations should also consider implementing web application firewalls and monitoring for suspicious shortcode usage patterns to detect potential exploitation attempts.