CVE-2026-75734 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.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 09/09/2026
Adobe Experience Manager contains a stored Cross-Site Scripting vulnerability that allows attackers with low privileges to inject malicious script code directly into application data stores through form fields. Unlike reflected XSS where payloads are delivered via URLs, this flaw persists in the backend database or file system, meaning the injected content is served back to users upon subsequent requests without further manipulation by the attacker. This persistence mechanism significantly increases the attack surface because every user who views the compromised page becomes a potential victim of the malicious script execution within their browser environment.
The technical root cause lies in insufficient input validation and output encoding mechanisms when processing data submitted through specific form interfaces. When an authenticated but low-privileged user submits content containing executable JavaScript, the application fails to properly sanitize or encode special characters before storing them for later retrieval. Consequently, when another user accesses a page that renders this stored data, the browser interprets the injected code as legitimate script rather than static text. This failure in context-aware encoding allows arbitrary commands to run with the same privileges and permissions as the victim's session, effectively bypassing standard security controls designed to prevent client-side injection attacks.
The operational impact of this vulnerability is severe due to its potential for widespread exploitation through social engineering or automated campaigns. An attacker can craft a payload that steals sensitive cookies, session tokens, or authentication credentials by exfiltrating them to a remote server controlled by the adversary. Furthermore, the malicious script can perform actions on behalf of the victim, such as modifying account settings, initiating financial transactions if applicable, or defacing web pages. Because the attack is stored, it does not require complex URL manipulation for each target; instead, simply visiting a compromised page triggers the exploit, making it highly efficient for targeting multiple users within an organization.
From a classification perspective, this vulnerability aligns with CWE-79 Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting and specifically falls under Stored XSS variants where data is persisted in non-volatile storage. In the context of the MITRE ATT&CK framework, this technique maps to T1059 Command and Control via Application Layer Protocol or potentially T1204 User Execution if it involves social engineering to get victims to visit specific pages. The ability for low-privileged users to execute code highlights a critical flaw in privilege separation and input validation logic within the application architecture.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Adobe has released patches that address this issue by implementing stricter output encoding and validating inputs against expected formats before storage. Organizations should immediately apply these updates to their production environments. Additionally, developers should enforce Content Security Policy headers to restrict the execution of inline scripts and limit script sources to trusted domains only. Implementing robust input validation on both client and server sides ensures that unexpected characters are rejected or safely encoded at the point of entry rather than relying solely on output encoding during rendering phases.