CVE-2026-1904 in Simple Wp Colorfull Accordion Plugin
Summary
by MITRE • 02/14/2026
The Simple Wp colorfull Accordion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title' parameter in the 'accordion' shortcode in all versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 02/20/2026
The Simple Wp colorfull Accordion plugin presents a critical stored cross-site scripting vulnerability that affects all versions up to and including 1.0. This vulnerability resides within the accordion shortcode implementation where the 'title' parameter fails to undergo proper input sanitization and output escaping mechanisms. The flaw enables authenticated attackers who possess Contributor-level access or higher privileges to inject malicious scripts into the plugin's title field, which then get stored persistently within the WordPress database. When other users access pages containing the compromised accordion elements, their browsers execute the injected scripts in the context of their current session, potentially leading to session hijacking, credential theft, or further exploitation of the compromised user accounts. The vulnerability demonstrates a classic stored xss pattern where malicious input is first stored on the server and then served to other users without proper sanitization.
The technical nature of this vulnerability aligns with CWE-79 which defines Cross-Site Scripting as a weakness where untrusted data is sent to a user agent without proper validation or sanitization. The flaw operates at the application layer where the plugin fails to implement proper input validation and output encoding before rendering user-supplied content. This represents a failure in the principle of least privilege and proper data sanitization, as the plugin does not adequately verify or escape the title parameter before storing it in the database. The vulnerability is particularly concerning because it requires only Contributor-level access, which is a relatively low privilege level in WordPress, making it accessible to users who can create and edit posts, pages, and media files. Attackers can leverage this access to inject scripts that execute in the context of other users' browsers, potentially enabling more sophisticated attacks such as privilege escalation or data exfiltration.
The operational impact of this vulnerability extends beyond simple script execution as it creates a persistent threat vector that can compromise multiple users over time. Once an attacker successfully injects malicious code through the title parameter, the script will execute whenever any user views a page containing the compromised accordion element, regardless of their privilege level or authentication status. This makes the vulnerability particularly dangerous in multi-user environments where administrators, editors, or even subscribers might be exposed to the malicious scripts. The stored nature of the vulnerability means that even if the initial attacker account is compromised or deleted, the injected scripts remain active and continue to pose a threat to all users who access affected pages. This persistent threat vector can be exploited to establish backdoors, steal cookies, redirect users to malicious sites, or perform other malicious activities that compromise the integrity and security of the entire WordPress installation.
Mitigation strategies for this vulnerability should focus on immediate patching of the plugin to version 1.1 or later, which should include proper input sanitization and output escaping mechanisms. Administrators should implement strict input validation for all user-supplied data, particularly in shortcode parameters, and ensure that all output is properly escaped before rendering in web pages. The WordPress security team should enforce the principle of least privilege by limiting the ability of low-privilege users to inject scripts into the system, while also implementing content security policies to prevent script execution. Additionally, regular security audits should be conducted to identify similar vulnerabilities in other plugins, and administrators should maintain updated security practices including regular plugin updates, monitoring of user activities, and implementation of web application firewalls. Organizations should also consider implementing automated scanning tools that can detect stored xss vulnerabilities in their WordPress installations, and establish incident response procedures for handling potential exploitation of such vulnerabilities. The ATT&CK framework categorizes this vulnerability under T1566 - Phishing and T1059 - Command and Scripting Interpreter, highlighting the social engineering aspects of the attack vector and the execution mechanisms that allow for persistent script injection.