CVE-2026-75735 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 access to inject malicious client-side scripts into persistent data fields. Unlike reflected XSS where the payload is delivered via a single request and disappears after execution, this flaw enables an attacker to store harmful JavaScript code directly on the server side through vulnerable input forms. When other users subsequently view or interact with pages containing these compromised form fields, their browsers automatically execute the injected script without requiring any additional interaction from the victim beyond normal page navigation. This persistence mechanism significantly increases the attack surface and potential impact because the malicious content remains active until it is manually removed by an administrator, affecting every user who accesses the affected content over time rather than just a single target or session.
The technical root cause of this vulnerability lies in insufficient input validation and output encoding within the application logic that processes form submissions for Adobe Experience Manager. The system fails to properly sanitize special characters such as angle brackets, quotes, and ampersands before storing them in the database or content repository. Consequently, when the stored data is rendered back into HTML context without adequate escaping mechanisms, the browser interprets the injected strings as executable code rather than plain text. This failure adheres closely to CWE-80, which describes improper neutralization of script-related HTML tags within a web page, and represents a classic instance of persistent XSS where the application trusts user-supplied input too readily during both storage and retrieval phases. The scope change mentioned in reports indicates that this vulnerability may have been previously categorized as less severe or limited to specific contexts but has now been confirmed to allow broader execution capabilities across different parts of the platform depending on how form data is rendered.
From an operational perspective, successful exploitation allows a low-privileged attacker to perform actions such as stealing session cookies, hijacking user sessions, performing unauthorized administrative actions on behalf of victims, defacing web pages, or redirecting users to malicious external sites designed for phishing or malware distribution. Because the script executes in the context of the victim's browser with their authentication tokens and permissions, it can bypass same-origin policy restrictions if not properly configured by administrators. This capability undermines the integrity and confidentiality guarantees provided by Adobe Experience Manager’s access control model. Attackers do not need high-level privileges to initiate this attack; they only require basic write or edit rights on specific content nodes or forms, which are often granted to marketing teams, content editors, or other non-technical staff members who regularly interact with the platform's interface.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The primary defense is applying the official security patches released by Adobe for the affected versions of Experience Manager, as these updates typically include enhanced input validation routines and stricter output encoding practices within the form processing modules. Administrators should also implement Content Security Policy headers to restrict the sources from which scripts can be loaded or executed, thereby limiting the impact even if an injection attempt occurs. Additionally, adopting a defense-in-depth approach involves enabling server-side sanitization libraries that automatically escape special characters before database insertion and ensuring that all dynamic content is rendered using safe DOM manipulation methods rather than innerHTML assignments where possible. Regular security audits of custom form components and third-party integrations are essential to identify similar flaws in other areas of the application logic, while user training can help reduce risks associated with social engineering tactics often used alongside XSS exploits to trick users into visiting compromised pages or clicking malicious links embedded within the stored scripts.