CVE-2026-75740 in Experience Manager as a Cloud Service
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 specific flaw involves input validation failures in server-side processing of form submissions. When an authenticated user submits content containing script tags or executable JavaScript event handlers through these vulnerable forms, the application fails to properly sanitize or encode the input before storing it in the backend database. Consequently, when other users subsequently view pages that render this stored data, the malicious code is served directly from the server and executed within the context of their browser session.
The operational impact of this vulnerability extends beyond simple script execution, as it fundamentally alters the scope of potential damage by enabling persistent attacks against multiple victims without requiring further interaction from the attacker after the initial injection. An adversary can leverage this flaw to steal sensitive information such as session cookies, authentication tokens, or personally identifiable data displayed on the page through techniques like cookie exfiltration using fetch requests or image tags pointing to external servers controlled by the attacker. Furthermore, if the victim possesses higher privileges within Adobe Experience Manager than the initial low-privileged attacker, the malicious script can perform actions on behalf of that user, potentially leading to unauthorized content modifications, administrative privilege escalation, or complete compromise of the digital experience platform's integrity and availability.
From a classification perspective, this vulnerability aligns with CWE-79 Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting, specifically under the stored variant where malicious scripts are permanently stored in target servers. In terms of adversary tactics, it maps to ATT&CK technique T1059 Command and Scripting Interpreter for executing JavaScript payloads and potentially T1078 Valid Accounts if the attacker leverages compromised low-privileged credentials to perform the initial injection. The persistence mechanism inherent in stored XSS makes this particularly dangerous as it does not rely on social engineering tricks like phishing links but rather exploits trust between users and the application's data storage mechanisms, allowing for widespread impact across all viewers of the affected content.
Mitigation strategies must focus on both immediate remediation and long-term defensive posture improvements. Administrators should apply the latest security patches provided by Adobe to address the input validation flaws in the form components immediately. From a development perspective, implementing strict output encoding is critical; developers must ensure that any data retrieved from storage and rendered into HTML contexts is encoded according to the specific context such as HTML entity encoding for body content or JavaScript string escaping for script blocks. Additionally adopting Content Security Policy headers can significantly reduce the impact of successful XSS attacks by restricting the sources from which scripts are allowed to load, thereby preventing the execution of injected payloads even if they bypass other filters. Regular security testing including automated static and dynamic analysis tools focused on detecting stored XSS patterns should be integrated into the software development lifecycle to identify similar vulnerabilities before deployment.