CVE-2026-75727 in Experience Manager
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 vulnerability within its form handling components, which allows attackers with low-privileged accounts to inject malicious client-side scripts into persistent data fields. Unlike reflected XSS where the payload is delivered via a link or request parameter that executes immediately upon viewing, this flaw involves input validation failures in server-side processing of user-supplied content. When an attacker submits specially crafted HTML or JavaScript code through these vulnerable form inputs, the application fails to properly sanitize or encode the malicious data before storing it in its backend database or session storage mechanisms. This lack of proper output encoding means that when other users subsequently access pages containing this stored payload, their browsers interpret and execute the injected script as if it were legitimate content originating from the trusted Adobe Experience Manager domain.
The operational impact of this vulnerability is significant because it enables persistent compromise without requiring complex social engineering tactics to deliver a one-time link. Once the malicious script is successfully stored on the server side, every user who views the affected page becomes a potential victim, effectively turning any authenticated session into an attack vector for data theft or account takeover. The attacker can exploit this execution context to steal sensitive information such as session cookies, authentication tokens, personally identifiable information, or administrative credentials displayed within the application interface. Furthermore, because the script runs with the same privileges and trust level as the legitimate website content, it can perform actions on behalf of the victim user, including making unauthorized API calls, modifying data, or redirecting users to phishing sites designed to capture further credentials.
From a technical classification perspective, this vulnerability aligns closely with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific nature of the flaw where input is stored and later retrieved for display without adequate sanitization also maps to CWE-83 in certain contexts involving dynamic code execution or improper handling of script tags within form fields. In terms of adversary behavior, this attack vector corresponds to techniques found in the MITRE ATT&CK framework under T1059 Command and Scripting Interpreter, specifically JavaScript interpretation, as well as T1204 User Execution if the initial trigger requires user interaction like clicking a link or visiting a specific page that renders the stored payload. The persistence aspect of storing malicious code on the server side distinguishes it from transient attacks and increases the difficulty of detection since the malicious content resides within legitimate application data structures rather than in temporary request parameters.
Mitigation strategies for this vulnerability require both immediate technical remediation and long-term architectural improvements. Adobe has released patches that address these specific input validation gaps, so applying the latest security updates to all instances of Adobe Experience Manager is the primary defense mechanism. Beyond patching, developers must implement strict output encoding practices ensuring that any user-supplied data rendered in HTML contexts is properly escaped using context-aware encodings such as HTML entity encoding for text nodes or attribute values. Input validation should also be enforced at multiple layers including client-side JavaScript checks and server-side regex-based filtering to reject dangerous characters like angle brackets, quotes, and script event handlers before they are persisted in the database. Additionally implementing Content Security Policy headers can help mitigate the impact by restricting where scripts can load from and preventing inline script execution even if an injection attempt succeeds. Regular security audits focusing on form handling logic and automated static analysis tools configured to detect XSS patterns will further reduce the risk of similar vulnerabilities emerging in custom components or integrations within the platform.