CVE-2025-64838: Adobe Experience Manager XSS Vulnerability

CVE-2025-64838 Overview

CVE-2025-64838 is a stored Cross-Site Scripting (XSS) vulnerability [CWE-79] affecting Adobe Experience Manager (AEM). A low-privileged authenticated attacker can inject malicious JavaScript into vulnerable form fields. The payload executes in a victim's browser when the victim views the page containing the injected content. Exploitation requires user interaction, and the vulnerability results in a scope change, meaning injected scripts can affect resources beyond the vulnerable component. Adobe addressed the issue in security bulletin APSB26-98.

Critical Impact
Authenticated attackers with low privileges can persist malicious JavaScript in form fields, hijack user sessions, steal credentials, or perform actions in the context of victim users across the AEM environment.

Affected Products

Adobe Experience Manager (AEM) — versions listed in Adobe advisory APSB26-98
Adobe Experience Manager Cloud Service deployments referenced by the advisory
Adobe Experience Manager on-premise installations covered by the same bulletin

Discovery Timeline

2026-09-08 - CVE-2025-64838 published to NVD
2026-09-10 - Last updated in NVD database

Technical Details for CVE-2025-64838

Vulnerability Analysis

The vulnerability is a stored XSS flaw in Adobe Experience Manager form-handling components. AEM fails to sanitize or encode attacker-controlled input submitted to specific form fields before persisting it and rendering it back to other users. A low-privileged authenticated user with permission to submit form data can inject JavaScript that is later executed in the browser of any user who loads the affected page.

Because the CVSS vector indicates a scope change, the injected script can reach and manipulate resources outside the security boundary of the vulnerable component. This magnifies the impact from a single form-field injection to potential cross-component compromise within the AEM instance.

Root Cause

The root cause is improper neutralization of input during web page generation [CWE-79]. Form-field content submitted by low-privileged users is stored and later rendered without adequate output encoding or context-aware sanitization. Standard AEM protections such as XSSAPI encoding are not consistently applied to the affected sinks.

Attack Vector

Exploitation requires network access to the AEM authoring or delivery interface and a valid low-privileged account. The attacker submits a crafted payload into a vulnerable form field. When a victim, including higher-privileged administrators, browses to the page rendering the stored content, the injected script executes in the victim's browser session. User interaction is required because the victim must load the affected page.

The vulnerability is described in prose only; no verified public exploit code is available. Refer to the Adobe Security Patch APSB26-98 advisory for vendor-supplied technical detail.

Detection Methods for CVE-2025-64838

Indicators of Compromise

Form field values in AEM repositories containing <script>, javascript:, event handlers such as onerror=, or encoded variants targeting XSS sinks.
Unexpected outbound requests from user browsers to attacker-controlled domains after loading AEM-rendered pages.
Session token exfiltration or unauthorized administrative actions correlating with visits to pages containing user-submitted form content.

Detection Strategies

Query the AEM JCR (Java Content Repository) for stored node property values containing HTML or JavaScript patterns in form-submission storage paths.
Enable and review AEM dispatcher and access logs for POST requests to form endpoints from low-privileged accounts, correlated with subsequent GET requests exhibiting anomalous response payloads.
Deploy Content Security Policy (CSP) reporting endpoints to capture inline-script violations originating from AEM-served pages.

Monitoring Recommendations

Monitor AEM audit logs for form submissions by users with author or contributor roles containing suspicious character sequences.
Alert on modifications to form-related JCR nodes outside of expected editorial workflows.
Track browser-side CSP violation reports and anomalous JavaScript execution on public-facing AEM pages.

How to Mitigate CVE-2025-64838

Immediate Actions Required

Apply the Adobe security update referenced in Adobe Security Patch APSB26-98 to all affected AEM instances.
Audit accounts with form-submission privileges and remove unnecessary low-privileged access to AEM authoring interfaces.
Review stored form-field content for existing malicious payloads and remove or sanitize identified entries.

Patch Information

Adobe released the fix in security bulletin APSB26-98. Administrators should consult the advisory for the specific AEM versions and Cloud Service releases addressed, and follow Adobe's guidance for deployment on authoring, publishing, and dispatcher tiers. On-premise customers must apply the corresponding service pack or hotfix; AEM Cloud Service customers receive the fix through the managed release channel.

Workarounds

Restrict form-submission permissions to trusted users only until the patch is applied.
Enforce a strict Content Security Policy on AEM-delivered pages to limit inline script execution and restrict script sources.
Configure the AEM dispatcher to filter or reject requests containing suspicious script markup on relevant form-submission endpoints.

bash

# Configuration example: dispatcher filter to block common XSS patterns on form endpoints
/0100 { /type "deny" /url '*<script*' }
/0101 { /type "deny" /url '*javascript:*' }
/0102 { /type "deny" /url '*onerror=*' }