CVE-2026-1823 in Consensus Embed Plugin
Summary
by MITRE • 03/07/2026
The Consensus Embed plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's consensus shortcode in all versions up to, and including, 1.6 due to insufficient input sanitization and output escaping on user supplied attributes. 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 • 03/08/2026
The vulnerability identified as CVE-2026-1823 affects the Consensus Embed plugin for WordPress, specifically targeting versions up to and including 1.6. This represents a critical security flaw that exploits stored cross-site scripting vulnerabilities within the plugin's consensus shortcode functionality. The issue arises from inadequate input sanitization and output escaping mechanisms that fail to properly validate or escape user-supplied attributes before processing them within the plugin's shortcode implementation. The vulnerability is particularly concerning as it requires only contributor-level access or higher, making it accessible to users who can create and edit content within the WordPress environment. Attackers with these privileges can leverage the flaw to inject malicious scripts that persist within the plugin's shortcode parameters, creating a persistent threat vector that remains active until manually removed.
The technical exploitation of this vulnerability occurs through the manipulation of shortcode attributes that are processed by the Consensus Embed plugin. When an authenticated attacker with contributor-level permissions creates or modifies content containing a malicious consensus shortcode with crafted attributes, the plugin fails to properly sanitize these inputs before rendering them in the output. This allows attackers to inject JavaScript code or other malicious payloads that are then executed whenever any user accesses pages containing the compromised shortcode. The stored nature of this XSS vulnerability means that the malicious scripts are permanently embedded within the plugin's processing logic, making them persistent threats that can affect multiple users over time without requiring repeated exploitation attempts. This vulnerability directly maps to CWE-79 which defines cross-site scripting flaws as weaknesses that allow attackers to inject client-side scripts into web applications.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with a persistent foothold within the WordPress environment. Once successfully exploited, the malicious scripts can perform various malicious activities including but not limited to cookie theft, session hijacking, redirection to malicious sites, data exfiltration, and privilege escalation within the WordPress system. The vulnerability affects all users who access pages containing the compromised shortcode regardless of their role within the WordPress installation, making it a significant threat to the entire user base. The persistence of the attack vector means that even if administrators discover and remove the malicious content, the underlying vulnerability remains exploitable by any attacker with contributor-level access, creating a continuous risk to the system's integrity and user security.
Mitigation strategies for CVE-2026-1823 should focus on immediate remediation through plugin updates to versions that address the input sanitization and output escaping deficiencies. Organizations should implement strict access controls and role-based permissions to limit contributor-level access to trusted users only, reducing the attack surface for potential exploitation. Regular security audits of WordPress plugins should include verification of input validation and output escaping mechanisms to identify similar vulnerabilities. The implementation of Content Security Policy headers can provide additional protection against script execution even if exploitation occurs. Security monitoring should be enhanced to detect unusual shortcode usage patterns and unauthorized content modifications. Organizations should also consider implementing web application firewalls to detect and block malicious shortcode parameter injections. According to ATT&CK framework, this vulnerability aligns with T1059.007 for script injection techniques and T1546.001 for privilege escalation through web application vulnerabilities, emphasizing the need for comprehensive defensive measures across multiple security domains.