CVE-2024-36166 in Experience Manager
Summary
by MITRE • 06/13/2024
Adobe Experience Manager versions 6.5.20 and earlier are affected by a stored Cross-Site Scripting (XSS) vulnerability that could be abused by an attacker to inject malicious scripts into vulnerable form fields. Malicious JavaScript may be executed in a victim’s browser when they browse to the page containing the vulnerable field.
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Analysis
by VulDB Data Team • 03/23/2025
Adobe Experience Manager represents a comprehensive web content management platform widely adopted by enterprises for digital experience creation and management. The platform serves as a central hub for content authors, marketers, and developers to create and deliver digital experiences across multiple channels. Given its extensive deployment across organizations, vulnerabilities within AEM can have significant operational and security implications. The stored XSS vulnerability in versions 6.5.20 and earlier specifically targets the platform's form handling mechanisms, creating a persistent threat vector that can compromise user sessions and execute unauthorized actions. This vulnerability is particularly concerning because it allows attackers to inject malicious scripts that persist in the application's data storage, making the attack surface much more extensive than typical XSS scenarios.
The technical flaw manifests in the improper sanitization of user input within form fields that are subsequently rendered back to users. When administrators or content authors create forms using AEM's built-in form components, the platform fails to adequately validate and escape user-supplied data before storing it in the repository. This stored data is then retrieved and displayed without proper context-aware encoding, creating an environment where malicious JavaScript code can be executed in the victim's browser context. The vulnerability specifically affects form fields that accept rich text input or allow HTML content, where the application does not properly distinguish between legitimate content and potentially malicious script tags. This flaw aligns with CWE-79 which defines Cross-Site Scripting as the failure to properly sanitize user input before rendering it in web pages. The persistence of the vulnerability means that even if the initial injection occurs during form creation, the malicious payload remains active until explicitly removed from the system.
The operational impact of this vulnerability extends beyond simple script execution, creating a comprehensive attack surface that can be leveraged for session hijacking, data exfiltration, and privilege escalation. An attacker who successfully injects malicious JavaScript can potentially steal user cookies, redirect victims to malicious sites, or even execute commands on behalf of authenticated users. The stored nature of the vulnerability means that once a malicious payload is injected into a form field, it can affect any user who views the page containing that field, regardless of their authentication status. This creates a particularly dangerous scenario where a single compromised form field can serve as a persistent backdoor for attackers. The attack vector can be initiated through various means including social engineering, where an attacker might convince an administrator to enter malicious content into a form field, or through automated attacks that exploit the vulnerability during form submission processes. According to ATT&CK framework, this vulnerability maps to T1531 which covers "Account Access Removal" and T1203 which addresses "Exploitation for Client Execution," demonstrating how the vulnerability can be leveraged to establish persistent access and execute malicious code in victim environments.
Organizations utilizing Adobe Experience Manager must implement comprehensive mitigation strategies to address this vulnerability. The primary recommendation involves upgrading to Adobe Experience Manager version 6.5.21 or later, where the XSS sanitization mechanisms have been enhanced to properly validate and escape user input. Additionally, administrators should implement strict input validation policies that prohibit or heavily restrict HTML content in form fields where possible. The implementation of Content Security Policy headers can provide an additional layer of protection by restricting script execution from unauthorized sources. Organizations should also conduct regular security assessments of their AEM implementations, focusing on form handling components and user input validation mechanisms. Monitoring for suspicious form submissions and implementing automated scanning tools can help detect potential exploitation attempts. The vulnerability also highlights the importance of principle of least privilege in AEM environments, where administrators should limit the ability of users to create or modify form fields that accept untrusted input. Security teams should establish incident response procedures specifically addressing XSS vulnerabilities in content management systems, ensuring rapid detection and remediation of similar threats.