CVE-2026-58588 in Canvas
Summary
by MITRE • 07/11/2026
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal Canvas allows Cross-Site Scripting (XSS). This issue affects Drupal Canvas versions: from 0.0.0 to 1.4.2, from 1.5.0 to 1.5.2, from 1.6.0 to 1.6.1, from 1.7.0 to 1.7.1.
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Analysis
by VulDB Data Team • 07/11/2026
This vulnerability represents a critical cross-site scripting flaw in the Drupal Canvas module that enables remote attackers to inject malicious scripts into web pages viewed by other users. The issue stems from inadequate input sanitization during web page generation processes where user-supplied data is not properly neutralized before being rendered in HTML contexts. This allows attackers to execute arbitrary JavaScript code within the victim's browser, potentially leading to session hijacking, data theft, or unauthorized actions performed on behalf of users.
The vulnerability specifically impacts multiple version ranges of Drupal Canvas including 0.0.0 through 1.4.2, 1.5.0 through 1.5.2, 1.6.0 through 1.6.1, and 1.7.0 through 1.7.1, indicating a widespread issue affecting various releases of the module. This classification aligns with CWE-79 which defines improper neutralization of input during web page generation as a fundamental weakness in web application security. The flaw occurs when the module fails to properly escape or validate user-provided content before incorporating it into dynamically generated HTML output.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack vectors including session cookie theft, redirection to malicious sites, defacement of web content, and potential privilege escalation within the application. Attackers can exploit this weakness by crafting malicious input that gets stored or displayed without proper sanitization, creating persistent XSS payloads that affect all users who view the compromised content. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under the T1059.007 category for script injection attacks.
Organizations utilizing affected Drupal Canvas versions should immediately implement mitigations including updating to patched versions, implementing proper input validation and output encoding mechanisms, and deploying web application firewalls with XSS detection capabilities. The remediation strategy should focus on ensuring all user-supplied content undergoes strict sanitization before HTML rendering, implementing Content Security Policy headers, and conducting comprehensive security testing of all dynamic content generation processes. Additionally, administrators should monitor for any signs of exploitation in web server logs and implement proper access controls to limit the impact of potential compromise within the Drupal environment.
This vulnerability demonstrates the critical importance of input validation and output encoding in web application security, particularly in modules that handle user-generated content or dynamic page construction. The widespread affected versions suggest this was a fundamental architectural flaw rather than an isolated incident, emphasizing the need for robust security practices throughout the software development lifecycle. Organizations should conduct thorough security assessments of their Drupal installations to identify other potential XSS vulnerabilities and ensure proper security hardening measures are in place across all web application components.