CVE-2025-46939: Adobe Experience Manager XSS Vulnerability

CVE-2025-46939 Overview

Adobe Experience Manager (AEM) versions 6.5.22 and earlier contain a stored Cross-Site Scripting (XSS) vulnerability [CWE-79]. A low-privileged attacker can inject malicious JavaScript into vulnerable form fields. The injected script executes in the browser of any victim who navigates to the affected page. The flaw affects both on-premise AEM deployments and AEM Cloud Service. Adobe published fixes in security bulletin APSB25-48.

Critical Impact
Authenticated attackers with low privileges can persist malicious scripts inside form fields, enabling session theft, credential harvesting, and unauthorized actions performed in the context of victim users, including content authors and administrators.

Affected Products

Adobe Experience Manager (on-premise) versions 6.5.22 and earlier
Adobe Experience Manager Cloud Service (AEM as a Cloud Service) affected releases
AEM deployments exposing form authoring or component-editing interfaces to low-privileged users

Discovery Timeline

2025-06-10 - CVE-2025-46939 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-46939

Vulnerability Analysis

The vulnerability is a stored Cross-Site Scripting flaw in AEM form field handling. AEM stores user-supplied field values in the repository and later renders them in author or end-user views without sufficient output encoding. When an attacker submits crafted input containing HTML or JavaScript, the payload is persisted and served to any user who loads the page containing the field.

Because the payload is stored server-side, exploitation does not require the victim to click a specially crafted link. Any authenticated or unauthenticated user visiting the affected page triggers script execution in their browser session. The scope-change indicator in the CVSS vector reflects that script execution crosses into the trust boundary of the AEM author or publish user context.

Root Cause

The root cause is improper neutralization of input during web page generation, as classified under [CWE-79]. Form field values are rendered without context-appropriate encoding, allowing HTML and script tokens to be interpreted by the browser. Adobe has not published detailed root-cause information beyond the advisory in APSB25-48.

Attack Vector

Exploitation requires network access to the AEM instance and an authenticated account with low privileges, such as a content contributor. The attacker injects a script payload into a vulnerable form field and saves it. Victim interaction is required: a separate user must browse to the page rendering the tainted field. Successful exploitation yields limited confidentiality and integrity impact within the victim's browser session, including cookie access, DOM manipulation, and impersonation of the victim's actions in the AEM interface.

No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. See the Adobe Security Advisory APSB25-48 for vendor guidance.

Detection Methods for CVE-2025-46939

Indicators of Compromise

Form field values in the AEM JCR repository containing <script>, onerror=, onload=, or javascript: tokens
Unexpected outbound requests from author or publish instances to attacker-controlled domains following page loads
New or modified content nodes created by low-privileged users that include HTML markup in text-only fields
Author session cookies (login-token) appearing in web server logs from unfamiliar source addresses

Detection Strategies

Query the JCR for stored properties matching common XSS payload patterns using AEM's Query Builder or JCR-SQL2
Inspect access logs for POST requests to /content/* and /libs/* endpoints originating from contributor-tier accounts
Deploy a Content Security Policy (CSP) in report-only mode to surface inline script violations rendered from stored content
Correlate content-modification events with subsequent script execution alerts in browser telemetry

Monitoring Recommendations

Enable AEM audit logging for cq:Page and nt:unstructured node changes performed by non-administrative users
Forward AEM Dispatcher and web server logs to a centralized analytics platform for pattern analysis
Alert on repeated form submissions containing HTML entities or script tokens from a single account
Review author accounts with elevated content-editing rights and validate their activity against change-management records

How to Mitigate CVE-2025-46939

Immediate Actions Required

Apply the Adobe security update referenced in APSB25-48 to all AEM 6.5 instances
Verify AEM as a Cloud Service instances are running the patched release channel
Audit existing content for previously injected script payloads and remove any that are found
Rotate credentials for author accounts that show anomalous content-modification activity

Patch Information

Adobe released fixes for CVE-2025-46939 in Adobe Experience Manager Service Pack updates beyond version 6.5.22 and in the current AEM Cloud Service release. Refer to Adobe's advisory APSB25-48 for exact version numbers, package names, and installation guidance for both on-premise and cloud deployments.

Workarounds

Restrict content authoring permissions so only trusted users can modify form fields
Deploy a strict Content Security Policy that blocks inline scripts on author and publish instances
Configure the AEM Dispatcher to filter suspicious characters in request parameters targeting form endpoints
Enable AEM's XSS Protection API and confirm custom components invoke XSSAPI.encodeForHTML for all user-supplied output

bash

# Example Dispatcher filter to block inline script tokens in form submissions
/0100 { /type "deny" /url "*<script*" }
/0101 { /type "deny" /url "*javascript:*" }
/0102 { /type "deny" /url "*onerror=*" }