CVE-2026-75643 in Experience Manager as a Cloud Service
Summary
by MITRE • 09/08/2026
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 and executed immediately upon viewing, this specific flaw involves input validation failures that permit script injection during the submission of form data. Once submitted, the malicious content is stored on the server side within the application's database or file system rather than being transiently passed through HTTP headers. This persistence mechanism ensures that every user who subsequently accesses the affected page containing the vulnerable field will have their browser execute the injected JavaScript code without any additional interaction from the attacker beyond the initial submission.
The technical root cause of this vulnerability lies in insufficient sanitization and encoding of user-supplied input before it is rendered back to other users' browsers. When the application retrieves the stored form data for display, it fails to properly escape special characters such as angle brackets or quotes that are essential for breaking out of HTML context. This oversight allows an attacker to embed executable JavaScript within what appears to be benign text fields, dropdown selections, or file upload descriptions. The scope change noted in recent advisories indicates that this vulnerability is exploitable by users with lower levels of authentication privileges than previously understood, significantly expanding the attack surface and lowering the barrier for entry for malicious actors who may have compromised standard user accounts rather than requiring administrative access.
The operational impact of exploiting this stored XSS flaw extends beyond simple script execution to include severe compromises in confidentiality, integrity, and availability. An attacker can utilize the executed JavaScript to steal session cookies or authentication tokens, thereby hijacking active sessions of other users including potentially high-privileged administrators if they view the compromised page. This capability facilitates account takeover attacks where the attacker gains unauthorized access to sensitive enterprise data managed within Adobe Experience Manager. Furthermore, the vulnerability enables phishing campaigns by allowing the injection of fake login forms that capture credentials from unsuspecting visitors. In more advanced scenarios, the script can be used to perform actions on behalf of the victim, such as modifying content settings or deleting pages, leading to defacement and disruption of business operations dependent on the platform for digital experience management.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. The primary defense is applying the official patches released by Adobe that correct the input validation logic in the affected form components. Organizations should prioritize updating their instances immediately upon availability of these security updates to close the persistent injection vector. In addition to patching, implementing a robust Content Security Policy (CSP) can significantly mitigate the impact of any successful XSS attempt by restricting the sources from which scripts are allowed to execute and preventing unauthorized data exfiltration. Input validation should be enforced on both client-side for user experience feedback and server-side as the definitive security control, ensuring that all special characters are properly encoded before storage and rendering.
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 storing malicious content for later execution places it firmly within the domain of stored XSS rather than reflected or DOM-based variants. In terms of adversary behavior mapping to MITRE ATT&CK, this vulnerability supports techniques such as T1059 Command and Control via Web Protocols if used for beaconing, but more directly relates to T1189 Drive-by Compromise where the victim is tricked into visiting a compromised page that executes malicious code. It also facilitates T1534 Internal Spearphishing if the injected content is designed to deceive users into revealing credentials or clicking on further malicious links within the application interface. Security teams should monitor for unusual patterns in form submissions and review access logs for signs of exploitation attempts targeting these specific endpoints.