CVE-2026-75738 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 handling subsystems, specifically affecting how user-supplied data is processed and rendered back to clients without adequate sanitization or encoding. This flaw allows an attacker with low-privileged access levels to inject malicious JavaScript code 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, the browser retrieves and executes the injected script automatically, creating a persistent threat vector that does not require social engineering tricks like phishing links to trigger execution beyond simple access to the affected area of the application.
The technical mechanism behind this vulnerability involves insufficient input validation on the server side when storing form data and inadequate output encoding when rendering that data in HTML contexts. The application fails to properly neutralize special characters such as angle brackets, quotes, or ampersands before inserting them into the database, and subsequently fails to encode these values again when generating the response page for end-users. This oversight allows raw JavaScript code to be embedded directly into the DOM structure of the web page. When a victim with valid credentials browses to the specific section containing the vulnerable form field, their browser parses the malicious script as part of the legitimate HTML content and executes it within the security context of the Adobe Experience Manager domain.
The operational impact of this vulnerability is significant due to its persistent nature and low barrier to entry for attackers. Because execution occurs automatically upon page load rather than requiring a specific trigger like clicking a link, the attack can affect multiple users who view the compromised content. Successful exploitation enables an attacker to perform actions such as stealing session cookies or authentication tokens, hijacking user sessions, performing unauthorized administrative actions on behalf of victims, defacing web pages, or redirecting users to malicious external sites designed for further attacks like phishing or malware distribution. The ability to execute scripts in the context of a trusted enterprise application undermines the integrity and confidentiality of sensitive corporate data managed through Adobe Experience Manager, potentially leading to broader network compromise if session tokens are used to access other internal systems.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. Administrators should apply the latest security patches provided by Adobe immediately to close this specific code path vulnerability. In environments where patching is delayed or not feasible, implementing a Web Application Firewall with rules capable of detecting and blocking stored XSS payloads in form submissions can provide an additional layer of defense. Furthermore, developers must enforce strict input validation on all user-supplied data entering the system and ensure that output encoding is applied consistently based on the context in which data is rendered, such as HTML body, attribute, or JavaScript contexts. Adhering to secure coding standards like OWASP Top 10 guidelines for injection prevention and implementing Content Security Policy headers can further mitigate the impact by restricting where scripts are allowed to execute from within the application domain.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-79 Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting, specifically in its stored variant. From a tactical perspective related to MITRE ATT&CK frameworks, this exploit maps to techniques involving Client-side Injection and potentially Credential Access through Session Hijacking if the attacker successfully extracts authentication tokens. The low privilege requirement for exploitation highlights the importance of implementing robust access controls and principle of least privilege across all user roles within Adobe Experience Manager to limit the potential blast radius should such a vulnerability be discovered in other components as well.