CVE-2026-75733 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 that allows attackers with low privileges to inject malicious client-side script code into application form fields. Unlike reflected XSS where the payload is delivered via a single request, this flaw persists within the server's database or storage mechanism. When an authenticated user with limited access rights submits data containing executable JavaScript through these vulnerable input vectors, the system fails to adequately sanitize or encode the content before storing it for later retrieval. This architectural oversight enables the malicious script to be embedded directly into the application state rather than being transiently passed in a URL parameter or header.
The operational impact of this vulnerability is significant because execution occurs when any user views the page containing the stored payload, not just the attacker who injected it. When an administrator or another authorized user navigates to the affected form or view, their browser parses and executes the embedded JavaScript within the context of the Adobe Experience Manager domain. This shift in scope from a targeted attack against specific users to a broader potential compromise means that any interaction with the tainted data can trigger the malicious code. The attacker does not need to trick a victim into clicking a specially crafted link; simply viewing the compromised page is sufficient for exploitation, thereby increasing the likelihood of successful execution and expanding the blast radius of the incident.
From a technical perspective, this flaw represents a failure in input validation and output encoding processes within the web application framework. The system accepts user-supplied data without sufficiently stripping out script tags or event handlers that could be interpreted by the browser's JavaScript engine. This aligns with CWE-79, which defines Improper Neutralization of Input During Web Page Generation as Common Weakness Enumeration identifier for Cross-Site Scripting vulnerabilities. By allowing raw HTML and JavaScript to persist in stored data fields, the application violates fundamental security principles regarding trust boundaries between user input and server-side processing logic.
The exploitation of this vulnerability can lead to severe consequences including session hijacking through cookie theft, credential harvesting via fake login forms injected into legitimate pages, or defacement of the user interface. Attackers may also use the script to perform actions on behalf of the victim if they have higher privileges, effectively escalating their own access level by leveraging the trust relationship between the browser and the Adobe Experience Manager application. This behavior is consistent with ATT&CK technique T1059 which covers Command and Scripting Interpreter usage for lateral movement or data exfiltration within enterprise environments.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Administrators should apply the latest security patches provided by Adobe to address this specific flaw in their instances of Experience Manager. In addition to patching, developers implementing custom forms or integrations should enforce strict input validation that rejects any non-alphanumeric characters where appropriate and implement robust output encoding such as HTML entity encoding for all dynamic content rendered in web pages. Implementing a Content Security Policy can also help mitigate the impact by restricting the sources from which scripts are allowed to execute, thereby preventing the injected payloads from running even if they manage to bypass other defenses.