CVE-2026-27239 in Experience Manager
Summary
by MITRE • 03/11/2026
Adobe Experience Manager versions 6.5.23 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 • 03/16/2026
Adobe Experience Manager versions 6.5.23 and earlier contain a critical stored cross-site scripting vulnerability that represents a significant threat to web application security. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically classified as a stored XSS flaw where malicious payloads are permanently stored on the server and executed when users access the affected content. The vulnerability manifests in form fields that do not properly sanitize user input, allowing attackers to inject malicious JavaScript code that persists in the application's database or storage mechanisms. When legitimate users browse to pages containing these vulnerable fields, their browsers execute the injected scripts within their security context, potentially compromising their sessions and enabling further attacks.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with a persistent foothold within the application environment. An attacker who successfully exploits this vulnerability can manipulate user sessions, steal authentication tokens, perform unauthorized actions on behalf of victims, and potentially escalate privileges within the AEM environment. The stored nature of this vulnerability means that the malicious code remains active even after the initial injection, creating a long-term threat that can affect multiple users over extended periods. This persistence aspect makes the vulnerability particularly dangerous as it can be leveraged for credential theft, session hijacking, and data exfiltration attacks. The vulnerability aligns with ATT&CK technique T1531 for Credential Access through session manipulation and T1059 for command and scripting interpreter execution.
Organizations utilizing Adobe Experience Manager must implement immediate remediation measures to address this vulnerability. The primary mitigation strategy involves upgrading to Adobe Experience Manager version 6.5.24 or later, which contains the necessary patches to prevent malicious input from being stored without proper sanitization. Additionally, administrators should implement comprehensive input validation and output encoding mechanisms throughout the application, particularly in form handling components. Web Application Firewalls should be configured to detect and block suspicious script patterns in user input, while security headers such as Content Security Policy should be enforced to limit script execution capabilities. Regular security testing including automated scanning and manual penetration testing should be conducted to identify similar vulnerabilities in custom components and extensions that may not have received the official patches. The vulnerability demonstrates the critical importance of proper input sanitization in web applications and highlights the need for comprehensive security testing throughout the software development lifecycle to prevent such persistent threats from entering production environments.