CVE-2026-75731 in Experience Manager 6.5
Summary
by MITRE • 09/09/2026
Adobe Experience Manager is affected by a stored Cross-Site Scripting (XSS) vulnerability that could be abused by a low-privileged 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. Scope is changed.
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Analysis
by VulDB Data Team • 09/09/2026
Adobe Experience Manager contains a stored cross-site scripting (XSS) vulnerability within its form handling components, specifically affecting how user-supplied data is processed and rendered back to clients without adequate sanitization or encoding. This flaw allows an attacker with low-privileged access levels to inject malicious JavaScript code into vulnerable input fields on the platform. Unlike reflected XSS where payload delivery requires tricking a user into clicking a crafted link, stored XSS persists within the application's database or backend storage. Consequently, every time a legitimate user accesses the affected page containing the compromised form field, their browser automatically executes the injected script in the context of the vulnerable site. This persistence mechanism significantly amplifies the attack surface because the malicious code is served dynamically to multiple victims over an extended period without requiring further interaction from the initial attacker.
The technical nature of this vulnerability aligns with CWE-79, which classifies improper neutralization of input during web page generation as a critical weakness in web application security frameworks. By failing to properly validate or encode special characters such as angle brackets and quotation marks before rendering them into HTML content, Adobe Experience Manager enables the browser's JavaScript engine to interpret injected strings as executable code rather than static text data. This breakdown in input validation allows attackers to bypass standard client-side protections that rely on simple string matching, especially if the application employs complex or inconsistent encoding rules across different form fields. The scope of this vulnerability is particularly concerning because it transforms a low-privileged account into a potent vector for widespread compromise, leveraging the trust relationship between the victim's browser and the Adobe Experience Manager domain to execute arbitrary scripts with full access to session cookies, local storage, and other sensitive client-side resources.
From an operational perspective, successful exploitation of this vulnerability can lead to severe consequences including session hijacking, credential theft, defacement of web content, or redirection of users to malicious phishing sites. Attackers may also use the injected script to perform actions on behalf of authenticated victims, such as modifying user profiles, changing administrative settings if higher privileges are accessible through cross-site request forgery techniques combined with XSS, or harvesting sensitive information displayed within the application interface. The impact extends beyond immediate data loss; it undermines the integrity and availability of the digital experience platform by eroding trust in the system's security posture. Organizations relying on Adobe Experience Manager for critical customer interactions face reputational damage and potential regulatory penalties if this vulnerability leads to a breach involving personally identifiable information or protected health information, depending on the industry sector.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Administrators should apply the latest security patches provided by Adobe as soon as they become available, ensuring that all instances of Experience Manager are updated to versions where this input validation flaw has been corrected at the source code level. In environments where patching is delayed due to operational constraints, implementing a Web Application Firewall (WAF) with rules specifically tuned to detect and block common XSS payloads can provide an additional layer of defense by filtering malicious requests before they reach the application server. Furthermore, developers should enforce strict output encoding practices using context-aware escaping techniques that convert special characters into their corresponding HTML entities based on where the data is being rendered within the DOM structure. Regular security assessments including static code analysis and dynamic penetration testing are essential to identify similar weaknesses in custom components or integrations built upon the Experience Manager platform.
This vulnerability also maps to specific tactics within the MITRE ATT&CK framework, particularly T1059 which covers command and script interpreter execution via browser-based mechanisms like JavaScript. The stored nature of the attack aligns with persistence techniques where malicious code remains active in the system until manually removed or patched. Security teams should monitor server logs for unusual patterns of form submissions containing encoded script tags or event handlers, as these may indicate ongoing exploitation attempts. Additionally, implementing Content Security Policy (CSP) headers can significantly mitigate the impact by restricting the sources from which scripts are allowed to execute, thereby preventing unauthorized inline scripts injected via XSS from running even if they successfully bypass other defenses. Continuous monitoring and proactive vulnerability management remain critical components of securing enterprise-grade content management systems against evolving web-based threats.