CVE-2026-75739 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 attacks that require tricking users into clicking specific links, this flaw enables the persistence of malicious payloads directly within the application's database or storage mechanisms. When an administrator or other authorized user subsequently views a page containing these compromised form fields, their browser automatically executes the injected JavaScript in the context of the vulnerable site. This shift from reflected to stored execution significantly increases the attack surface and severity, as it does not rely on social engineering tactics to deliver the payload but rather exploits the trust users place in legitimate application content.
The technical root cause lies in insufficient input validation and output encoding within the specific form processing modules of Adobe Experience Manager. The system fails to properly sanitize user-supplied data before storing it or fails to encode that data appropriately when rendering it back to the client side. This oversight allows special characters, such as angle brackets and quotation marks, to be interpreted as executable code rather than plain text by the victim's web browser. Consequently, an attacker can embed script tags, event handlers, or other malicious JavaScript constructs into fields like comments, profile descriptions, or custom metadata entries. The vulnerability is particularly dangerous because it leverages the existing authentication session of the victim user, allowing the injected scripts to perform actions with the same privileges as that user without requiring additional credential theft via phishing links.
The operational impact of this vulnerability extends beyond simple defacement or cookie stealing. Since Adobe Experience Manager often serves as a central hub for content management and digital asset distribution, successful exploitation can lead to comprehensive account takeover if session cookies are accessible. Attackers may use the executed scripts to perform actions on behalf of high-privileged administrators, such as modifying site configurations, publishing malicious content to public-facing pages, or exfiltrating sensitive enterprise data stored within the platform. Furthermore, because the payload is stored server-side, every user who accesses the affected page becomes a potential victim, creating a persistent threat vector that remains active until the malicious content is manually removed from the database. This persistence can lead to widespread compromise across an organization's digital infrastructure if left unaddressed.
Mitigation strategies primarily involve applying the vendor-provided security patches and updates released by Adobe for the affected versions of Experience Manager. Organizations should ensure their patch management processes are agile enough to deploy these fixes promptly, as exploits for such vulnerabilities often become public shortly after disclosure. In addition to immediate patching, administrators should enforce strict input validation rules on all form fields that accept user-generated content, ensuring that only expected data types and formats are accepted at the application layer. Implementing a Content Security Policy (CSP) can also serve as an effective defense-in-depth measure by restricting the sources from which scripts can be loaded or executed, thereby neutralizing many stored XSS payloads even if they manage to bypass input filters. Regular security audits and penetration testing focused on cross-site scripting flaws are recommended to identify similar weaknesses in custom components or integrations that may not receive immediate vendor patches.
From a classification perspective, this vulnerability aligns with CWE-79 Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific nature of the attack where malicious scripts are stored on the target server and later executed by other users corresponds to the Stored XSS sub-category within this weakness definition. In terms of tactical mapping, this vulnerability facilitates initial access and potentially privilege escalation depending on the victim's role, aligning with ATT&CK techniques related to Client-side Injection and Session Credential Harvesting via Browser Request Interception if session tokens are targeted. Understanding these classifications helps security teams prioritize remediation efforts based on industry-standard risk frameworks and ensure that defensive controls like Web Application Firewalls (WAFs) are tuned to detect the specific patterns associated with stored script injection in form fields.