CVE-2026-114525 in ABC Plugin
Summary
by MITRE • 10/30/2026
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal ABC allows Stored XSS. This issue affects ABC versions: from 0.0.0 to 1.25.0, from 2.0.0 to 2.0.1.
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Analysis
by VulDB Data Team • 10/30/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this vulnerability manifests as Stored XSS within the Drupal ABC module for versions ranging from 0.0.0 to 1.25.0 and from 2.0.0 to 2.0.1. Unlike reflected XSS attacks where malicious scripts are executed via a crafted URL passed by an attacker, stored vulnerabilities involve the persistence of malicious content on the target server. In this context, user-supplied input is accepted by the application without adequate sanitization or validation and subsequently saved in a database or other persistent storage mechanism. When legitimate users later access pages that render this data, the embedded script executes within their browser session under the security context of the vulnerable Drupal site.
From a technical perspective, the root cause lies in the failure to properly encode output when rendering user-generated content. The application likely treats input fields as safe HTML or fails to escape special characters such as angle brackets, quotes, and ampersands before inserting them into dynamic web pages. This allows an attacker to inject JavaScript code that can perform a variety of malicious actions. Because the payload is stored on the server, it does not require social engineering tactics like phishing links to trigger execution for every victim; instead, any user who views the compromised content becomes a potential target automatically.
The operational impact of this vulnerability is severe due to its persistent nature and broad reach. An attacker can steal session cookies or authentication tokens, effectively hijacking user accounts and gaining unauthorized access to sensitive administrative functions or private data within the Drupal environment. Furthermore, the malicious script can manipulate the DOM (Document Object Model) to deface web pages, redirect users to phishing sites designed to harvest credentials, or deploy malware onto victim systems through drive-by downloads if browser vulnerabilities are present. The trust relationship between the user and the website is exploited, leading to potential data breaches, loss of integrity for site content, and significant reputational damage for the organization hosting the Drupal instance.
This vulnerability maps directly to CWE-79, which covers Improper Neutralization of Input During Web Page Generation (Cross-site Scripting), and specifically aligns with MITRE ATT&CK technique T1059.007, indicating JavaScript as a common execution vector for client-side code injection attacks. The stored nature of the exploit also correlates with persistence mechanisms where malicious content remains active until manually removed or overwritten by legitimate updates.
To mitigate this risk, immediate action is required to update the Drupal ABC module to a patched version that addresses these input handling flaws. Developers must implement strict output encoding using context-aware methods appropriate for HTML body attributes and script contexts. Input validation should be enforced on both client and server sides to reject unexpected characters or structures before they reach storage layers. Additionally, deploying Content Security Policy headers can help mitigate the impact of any successful XSS attempts by restricting the sources from which scripts are allowed to load and execute. Regular security audits and static code analysis tools configured to detect missing output encoding patterns should be integrated into the development lifecycle to prevent similar vulnerabilities in future releases.