CVE-2026-76758 in Link content parser
Summary
by MITRE • 09/02/2026
Vulnerability in Drupal Link content parser. This issue affects Link content parser versions: *.*.
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Analysis
by VulDB Data Team • 09/02/2026
The vulnerability identified within the Drupal Link content parser represents a significant security risk for websites utilizing this module, particularly those running any version of the software as indicated by the wildcard notation affecting all releases. The core technical flaw resides in how the application processes and validates input data associated with link attributes before rendering them to end users or storing them in the database backend. In many content management systems, parsers are responsible for sanitizing user-supplied data to prevent malicious scripts from being executed within the context of a trusted domain. When this parsing logic is flawed, it fails to adequately strip or neutralize dangerous payload components embedded within link metadata such as href attributes, title tags, or other custom properties defined by content editors and third-party integrations.
This deficiency typically manifests as an injection vulnerability where attackers can inject malicious JavaScript code that executes in the browsers of legitimate users visiting affected pages. The operational impact is severe because it facilitates Cross-Site Scripting attacks which allow threat actors to hijack user sessions, steal sensitive cookies containing authentication tokens, deface web content, or redirect victims to phishing sites designed to harvest credentials. Since Drupal powers a substantial portion of the internet's enterprise and government websites, the widespread nature of this flaw means that any site using the vulnerable Link parser version is potentially exposed to these attacks without requiring complex exploitation techniques beyond convincing a user with access privileges to save content containing the malicious payload or for unauthenticated users if the vulnerability allows execution upon page view.
From an industry standards perspective, this issue aligns closely with CWE-79 which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The attack vector leverages the trust that browsers place in content served from a specific domain to execute scripts belonging to other domains or malicious actors. Furthermore, within the MITRE ATT&CK framework this behavior corresponds to techniques involving Client-side Injection and potentially Account Manipulation if session tokens are stolen leading to unauthorized access. The persistence of such vulnerabilities often stems from insufficient validation rules that do not account for encoded characters, case variations, or alternative event handlers that can trigger script execution outside standard onclick attributes.
Mitigation strategies must prioritize immediate remediation through software updates provided by the Drupal security team which patch the parsing logic to enforce strict allow-listing of safe HTML tags and attributes while stripping out any executable content such as javascript: URIs or on* event handlers. In cases where updating is not immediately feasible, administrators should implement Web Application Firewall rules that detect and block requests containing suspicious patterns in link fields before they reach the application layer. Additionally enforcing Content Security Policy headers can significantly reduce the impact of successful exploitation by restricting the sources from which scripts are allowed to load thereby preventing injected code from executing even if it bypasses input validation measures. Regular security audits and penetration testing focused on content entry points will help identify similar parsing weaknesses across other modules ensuring a more robust defense posture against injection-based threats.