CVE-2026-75736 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 content management and form processing subsystems, specifically affecting how user-supplied data is rendered back into web pages without adequate sanitization or encoding. This flaw allows an attacker with low-privileged access to inject malicious JavaScript code directly into vulnerable form fields during the initial submission phase. Unlike reflected XSS where the payload is part of a single request, this stored variant persists on the server side within the application's database or content repository. Consequently, every time a legitimate user accesses the page containing the compromised field, their browser retrieves and executes the embedded script automatically without further interaction from the attacker.
The technical mechanism behind this vulnerability involves insufficient input validation and output encoding in the rendering engine of Adobe Experience Manager. When an authenticated but low-privileged user submits data through specific forms, the application accepts the payload and stores it as part of the page content or component configuration. Later, when another user views that same content, the server generates HTML containing the malicious script tags. Because modern browsers treat scripts embedded in trusted pages as legitimate code from the origin domain, they execute these scripts with the full privileges associated with that site's security context. This bypasses standard browser protections such as Same-Origin Policy and Content Security Policy if those policies are not strictly configured to block inline scripts or unauthorized external resources.
The operational impact of this vulnerability is significant because it enables session hijacking, credential theft, defacement, or the installation of malware on victim machines through drive-by downloads. An attacker can craft a payload that exfiltrates sensitive cookies containing authentication tokens, effectively allowing them to impersonate legitimate users and escalate their privileges within the Adobe Experience Manager environment. Furthermore, since the attack does not require social engineering tactics like phishing links for each instance, it scales efficiently across all viewers of the affected content. The scope change noted in recent advisories indicates that previous assessments may have underestimated the accessibility or impact vector, confirming that even users with minimal permissions can trigger this chain of events, thereby widening the potential blast radius within an organization's digital asset management infrastructure.
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 the specific input validation flaws in the affected components. In addition to patching, organizations should implement strict Content Security Policy headers that restrict script execution sources and disable inline scripts where possible. Input sanitization libraries must be employed at both the client and server levels to ensure special characters are properly encoded before storage and rendering. Regular security audits of form handling logic and continuous monitoring for anomalous content injection patterns can further reduce risk exposure while ensuring compliance with industry standards such as OWASP Top 10 guidelines regarding cross-site scripting prevention.