CVE-2025-64584: Adobe Experience Manager XSS Vulnerability

CVE-2025-64584 Overview

Adobe Experience Manager (AEM) contains a stored Cross-Site Scripting (XSS) vulnerability tracked as CVE-2025-64584. A low-privileged authenticated attacker can inject malicious JavaScript into vulnerable form fields. The injected payload executes in a victim's browser when the victim loads the page rendering the affected field. The vulnerability is classified under [CWE-79], improper neutralization of input during web page generation. The scope changes when the payload executes, allowing impact beyond the vulnerable component boundary. Adobe published fix guidance in security advisory APSB26-98.

Critical Impact
A low-privileged attacker can inject persistent JavaScript into AEM form fields, resulting in script execution in victim browsers, potential session compromise, and cross-scope impact affecting other AEM users.

Affected Products

Adobe Experience Manager (AEM) — refer to Adobe advisory APSB26-98 for exact affected versions
AEM Cloud Service deployments referenced by the advisory
On-premises AEM Forms components exposing user-editable form fields

Discovery Timeline

2026-09-08 - CVE-2025-64584 published to the National Vulnerability Database
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2025-64584

Vulnerability Analysis

The flaw is a stored XSS in Adobe Experience Manager form field handling. Adobe describes the issue as improper output encoding or input sanitization on form field values that are later rendered into HTML responses. Because the payload is stored on the server, every subsequent user who loads the affected page executes the attacker-controlled script. The attacker requires authenticated access at a low privilege tier, which reduces the attack barrier for tenants where content authoring is broadly delegated. User interaction is required — the victim must navigate to the rendered page. The scope-changed classification indicates the injected script can affect resources outside the security scope of the vulnerable component, such as an administrative UI rendered in the same origin.

Root Cause

The root cause is missing or insufficient neutralization of user-controlled input written into HTML sinks within AEM form field rendering [CWE-79]. Form field values submitted through authoring or user-facing interfaces are stored without adequate escaping and later reflected into rendered pages without contextual encoding. When output reaches a JavaScript execution context, script tags or event handlers are interpreted by the browser.

Attack Vector

An authenticated attacker with low privileges submits a crafted payload into a vulnerable form field. The payload is persisted in the AEM repository. When another user, potentially with higher privileges, browses to a page that renders the stored value, the script executes in the victim's browser session. Consequences include session token theft, forced actions against AEM authoring APIs, defacement, and pivoting to administrative functionality that shares the origin.

// No verified public proof-of-concept is available.
// See Adobe advisory APSB26-98 for technical details and
// vendor-supplied remediation guidance.

Detection Methods for CVE-2025-64584

Indicators of Compromise

Form field values containing <script>, javascript:, onerror=, onload=, or onmouseover= handlers stored in the AEM JCR repository
Unexpected outbound requests from browser sessions of AEM authors or administrators to attacker-controlled domains
Anomalous POST requests from low-privileged accounts to form submission endpoints containing HTML or encoded script fragments

Detection Strategies

Query the AEM content repository for stored field values matching HTML tag or event-handler patterns and review author identity
Enable and review AEM access.log and audit log entries for form submissions from low-privileged accounts followed by higher-privileged page views
Deploy a Content Security Policy (CSP) in report-only mode to surface inline script execution attempts on rendered form pages

Monitoring Recommendations

Monitor web application firewall (WAF) logs for XSS signatures targeting AEM form endpoints
Alert on browser CSP violation reports originating from AEM-hosted origins
Correlate authoring-account activity with anomalous JavaScript execution or credential submission events on downstream pages

How to Mitigate CVE-2025-64584

Immediate Actions Required

Apply the security update referenced in Adobe advisory APSB26-98 to all affected AEM instances
Audit low-privileged authoring accounts and revoke unnecessary form-editing permissions
Review recently modified form field content for stored script payloads and sanitize identified entries

Patch Information

Adobe published fix guidance in Adobe Security Advisory APSB26-98. Administrators should consult the advisory for exact affected versions, patched build numbers, and cloud service release identifiers.

Workarounds

Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources on pages rendering form field content
Restrict form authoring privileges to trusted user groups until patches are applied
Enable AEM Dispatcher filters to block requests containing HTML metacharacters in unexpected form parameters

bash

# Example AEM Dispatcher filter snippet to reject suspicious payloads
/0100 { /type "deny" /url "*<script*" }
/0101 { /type "deny" /url "*javascript:*" }
/0102 { /type "deny" /url "*onerror=*" }