CVE-2025-64588: Adobe Experience Manager XSS Vulnerability

CVE-2025-64588 Overview

Adobe Experience Manager (AEM) contains a stored Cross-Site Scripting (XSS) vulnerability tracked as CVE-2025-64588. A low-privileged authenticated attacker can inject malicious JavaScript into vulnerable form fields. The payload executes in a victim's browser when they load the page containing the affected field. The scope is changed, meaning the impact extends beyond the vulnerable component to other resources under a different security authority. The weakness is classified under [CWE-79], Improper Neutralization of Input During Web Page Generation.

Critical Impact
Authenticated attackers can persist malicious scripts in AEM form fields, enabling session theft, credential harvesting, or unauthorized actions performed in the context of higher-privileged users who view the affected content.

Affected Products

Adobe Experience Manager (see Adobe Security Bulletin APSB26-98 for specific affected versions)
Adobe Experience Manager Cloud Service deployments referenced in the vendor bulletin
Adobe Experience Manager on-premise instances within the vulnerable version range

Discovery Timeline

2026-09-08 - CVE-2025-64588 published to the National Vulnerability Database
2026-09-10 - Last updated in NVD database

Technical Details for CVE-2025-64588

Vulnerability Analysis

The vulnerability is a stored XSS flaw in Adobe Experience Manager form handling. AEM fails to properly neutralize user-supplied input written into form fields before that input is rendered back to other users. An authenticated attacker with low privileges submits input containing JavaScript, and AEM persists that input without sufficient encoding or sanitization. When any user later loads a page that renders the stored field, the browser interprets the payload as executable script. Because exploitation requires user interaction and low privileges, it is well suited to insider abuse or compromise of low-tier author accounts. The changed scope indicates the impact reaches beyond the vulnerable component, allowing an attacker to influence data or sessions belonging to a different security context. The EPSS probability is 0.271%.

Root Cause

The root cause is improper output encoding of user-controllable data written to AEM form field markup. Input passes through the persistence layer and back to the rendering layer without contextual escaping for HTML or JavaScript contexts, satisfying the conditions described in [CWE-79].

Attack Vector

Exploitation is network-based. An attacker authenticates to AEM with a low-privileged account, such as an author or contributor role, and submits a crafted payload into a vulnerable form field. The payload is stored server-side. When a victim, potentially an administrator or content reviewer, navigates to the page containing that field, the malicious JavaScript runs in their browser session. The attacker can then hijack sessions, exfiltrate tokens, or trigger privileged workflows in the victim's context. Refer to the Adobe Security Bulletin APSB26-98 for vendor-confirmed exploitation prerequisites.

// No verified proof-of-concept code is available.
// See Adobe Security Bulletin APSB26-98 for vendor guidance.

Detection Methods for CVE-2025-64588

Indicators of Compromise

Stored content in AEM repositories containing <script> tags, javascript: URIs, or HTML event handler attributes such as onerror, onload, or onmouseover in unexpected form fields.
Outbound requests from authenticated user browsers to unknown domains shortly after loading AEM authoring or preview pages.
Unexpected session token requests or authenticated API calls originating from browser sessions rather than known automation.

Detection Strategies

Audit AEM content repositories for persisted form field values containing HTML or JavaScript syntax that should have been encoded.
Deploy Content Security Policy (CSP) reporting to capture script-src violations triggered when injected payloads attempt to execute.
Correlate low-privileged author account activity with subsequent anomalous admin session behavior using SIEM analytics.

Monitoring Recommendations

Forward AEM access logs, authoring events, and CSP violation reports to a centralized analytics platform for correlation.
Alert on modifications to form components performed by newly created or rarely used low-privileged accounts.
Monitor for browser-side anomalies such as unexpected DOM injections or requests to attacker-controlled hosts from AEM origin pages.

How to Mitigate CVE-2025-64588

Immediate Actions Required

Apply the Adobe security update referenced in Adobe Security Bulletin APSB26-98 to all AEM instances.
Review and revoke unnecessary low-privileged author accounts, and enforce strong authentication for all remaining accounts.
Audit existing form content for stored payloads and remove any injected scripts before restoring normal access.

Patch Information

Adobe addressed CVE-2025-64588 in the update described in Adobe Security Bulletin APSB26-98. Administrators should consult the bulletin for the fixed version numbers applicable to their AEM deployment model and apply the corresponding update through their standard patch process.

Workarounds

Restrict authoring permissions so only trusted users can submit content into affected form components until patching is complete.
Enforce a strict Content Security Policy on AEM-delivered pages to block inline script execution and untrusted script sources.
Deploy a web application firewall rule set that inspects form submissions for HTML and JavaScript payloads targeting AEM endpoints.

bash

# Example Content Security Policy header to reduce XSS impact on AEM-served pages
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'; report-uri /csp-report