CVE-2025-1627 in Qi Blocks Plugin
Summary
by MITRE • 05/19/2025
The Qi Blocks WordPress plugin before 1.4 does not validate and escape some of its block options before outputting them back in a page/post where the block 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 • 01/10/2026
The vulnerability identified as CVE-2025-1627 affects the Qi Blocks WordPress plugin version 1.4 and earlier, representing a critical security flaw that enables stored cross-site scripting attacks through improper input validation and output escaping mechanisms. This vulnerability specifically targets the plugin's handling of block options within WordPress pages and posts, creating a persistent threat vector that can be exploited by users possessing contributor-level privileges or higher.
The technical flaw resides in the plugin's failure to properly sanitize and escape user-provided block options before rendering them in the frontend output. When administrators or contributors create or modify content using Qi Blocks, the plugin processes various block configuration parameters without adequate validation controls. This oversight allows malicious actors to inject malicious scripts into block settings that are then executed whenever the affected page or post is viewed by other users. The vulnerability operates as a stored XSS attack because the malicious code is permanently saved within the WordPress database and executed each time the content is rendered, rather than requiring a single click or immediate interaction.
From an operational perspective, this vulnerability presents significant risks to WordPress sites utilizing the Qi Blocks plugin, as it enables attackers with contributor permissions to compromise the integrity of the website and potentially escalate their privileges. The impact extends beyond simple script execution, as attackers can leverage this vulnerability to steal user sessions, deface content, redirect visitors to malicious sites, or harvest sensitive information from authenticated users. The stored nature of the attack means that the malicious payload persists even after the initial exploitation, making it particularly dangerous for content management systems where multiple contributors may have access to the plugin's features.
The vulnerability aligns with CWE-79, which describes cross-site scripting flaws, and demonstrates characteristics consistent with ATT&CK technique T1546.001 for modifying system binaries and T1566.001 for credential access through social engineering. Organizations using the affected plugin should immediately implement mitigation strategies including updating to version 1.4 or later, which contains proper input validation and output escaping mechanisms. Additionally, administrators should consider implementing additional security measures such as restricting contributor privileges to prevent unauthorized access to block editing features, monitoring for suspicious block configurations, and conducting regular security audits of plugin installations. The remediation process should also include reviewing existing content for potential malicious scripts and ensuring that proper access controls are in place to limit who can modify block settings within the WordPress environment.