CVE-2025-44141 in Backdrop
Summary
by MITRE • 06/26/2025
A Cross-Site Scripting (XSS) vulnerability exists in the node creation form of Backdrop CMS 1.30.
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Analysis
by VulDB Data Team • 03/04/2026
The vulnerability CVE-2025-44141 represents a critical cross-site scripting flaw within Backdrop CMS version 1.30 that specifically affects the node creation form functionality. This vulnerability stems from inadequate input validation and output sanitization mechanisms within the content management system's form handling processes. The issue manifests when users attempt to create new content nodes through the administrative interface, where malicious script code can be injected into form fields and subsequently executed in the context of other users' browsers. The vulnerability directly maps to CWE-79 which defines cross-site scripting as a condition where an application includes untrusted data in a new web page without proper validation or escaping, allowing attackers to execute scripts in the victim's browser. This weakness creates a persistent threat vector that can be exploited across multiple user sessions and can potentially escalate to more severe attacks if combined with other vulnerabilities.
The technical implementation of this XSS vulnerability occurs within the node creation form processing logic where user-supplied data is not adequately sanitized before being rendered back to users. When administrators or content creators submit form data containing malicious script payloads, the system fails to properly escape or validate these inputs, allowing the scripts to execute in the browsers of other users who view the affected content. The vulnerability affects the core content management functionality and can be exploited through various attack vectors including direct form submission, API endpoints that process node creation requests, or even through crafted URLs that trigger the vulnerable form rendering. This type of vulnerability falls under the ATT&CK technique T1203 which describes the use of web shells and command and control channels, though in this case the attack vector is more specifically focused on client-side script execution rather than server-side compromise.
The operational impact of this vulnerability extends beyond simple script execution as it can enable attackers to steal session cookies, perform actions on behalf of authenticated users, or redirect victims to malicious websites. An attacker could potentially craft malicious content that, when viewed by an administrator, would execute scripts to exfiltrate sensitive data, modify content, or establish persistent access to the system. The vulnerability is particularly concerning in environments where multiple administrators have access to the content creation forms, as it could enable privilege escalation attacks or unauthorized content manipulation. The attack surface is broadened by the fact that this vulnerability affects the core CMS functionality, making it accessible to attackers regardless of the specific modules or themes installed on the platform. Organizations using Backdrop CMS 1.30 should immediately implement mitigations as the vulnerability can be exploited without authentication and can affect any user with sufficient privileges to create content nodes, potentially leading to complete system compromise through session hijacking or data exfiltration.
Recommended mitigations include immediate patching of the Backdrop CMS to version 1.31 or later where this vulnerability has been addressed through proper input sanitization and output escaping mechanisms. Organizations should also implement additional security measures such as content security policy headers, regular input validation checks, and monitoring of content creation activities. The implementation of web application firewalls can provide additional protection layers while the system remains vulnerable. Security teams should conduct comprehensive audits of all user inputs and outputs, particularly focusing on form handling processes and content rendering mechanisms. Regular security training for content creators and administrators can help prevent accidental exploitation through social engineering or phishing attacks that might attempt to leverage this vulnerability. The vulnerability also highlights the importance of maintaining current software versions and implementing robust security testing procedures including automated scanning for XSS vulnerabilities in all web applications.