CVE-2025-46900: Adobe Experience Manager XSS Vulnerability

CVE-2025-46900 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 payload executes in a victim's browser when they load the page rendering the affected field. The flaw impacts both on-premise AEM and AEM Cloud Service deployments. Adobe addressed the issue in Security Advisory APSB25-48.

Critical Impact
Stored XSS allows an authenticated attacker with low privileges to execute arbitrary JavaScript in the context of any user who views a page containing the tainted form field, enabling session theft, credential harvesting, and content manipulation.

Affected Products

Adobe Experience Manager 6.5.22 and earlier (on-premise)
Adobe Experience Manager Cloud Service (AEM as a Cloud Service)
Any AEM deployment exposing the vulnerable form field component

Discovery Timeline

2025-06-10 - CVE-2025-46900 published to the National Vulnerability Database
2025-06-10 - Adobe publishes Security Advisory APSB25-48
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-46900

Vulnerability Analysis

The vulnerability is a stored Cross-Site Scripting flaw in Adobe Experience Manager form field handling. AEM fails to properly sanitize or encode user-supplied input before persisting it and rendering it back in the HTML response. An attacker with an authoring or contributor-level account can submit crafted content containing HTML or JavaScript payloads. The payload is stored server-side within the JCR repository and later served to visitors of the affected page.

Because the scope metric is changed, the injected script executes in the security context of the AEM-hosted domain, potentially reaching other users and administrative sessions. Exploitation requires user interaction, meaning a victim must load or interact with the page containing the poisoned field.

Root Cause

The underlying defect is missing or insufficient output encoding on form field content rendered by AEM components. Input that should be treated as text is instead reflected into the DOM without contextual escaping, allowing <script> tags and event-handler attributes to execute. This is a classic CWE-79 pattern where server-side sanitization does not match the sink context.

Attack Vector

An authenticated attacker with low-level publishing rights authors a page or component containing a JavaScript payload inside a vulnerable form field. Once the content is published, any visitor loading that page triggers execution of the payload. The attacker can steal session cookies, perform actions on behalf of authenticated administrators, deface content, or redirect users to attacker-controlled sites. No verified proof-of-concept code is publicly available. Refer to Adobe Security Advisory APSB25-48 for vendor technical details.

Detection Methods for CVE-2025-46900

Indicators of Compromise

Form field content in the JCR repository containing <script>, javascript:, or event-handler attributes such as onerror= and onload=
Unexpected outbound requests from user browsers to external domains after loading AEM-hosted pages
Publish or activation events on pages authored by low-privileged accounts touching form components
Anomalous JavaScript errors or content-security-policy violations logged from the AEM publish tier

Detection Strategies

Review AEM audit logs for content modifications to form components by non-administrative users
Scan JCR nodes for HTML markup or script tokens in properties that should contain plain text
Deploy a web application firewall rule to flag form submissions containing script tags or JavaScript URI schemes
Enable and monitor Content Security Policy (CSP) violation reports to surface injected inline scripts

Monitoring Recommendations

Ingest AEM access.log, error.log, and audit.log into a centralized SIEM for correlation
Alert on repeated publish or replication events originating from accounts with limited privileges
Track anomalous DOM-based network beacons from authenticated user sessions on AEM-hosted domains

How to Mitigate CVE-2025-46900

Immediate Actions Required

Upgrade Adobe Experience Manager to the fixed version listed in APSB25-48
Audit existing form field content for stored payloads and purge malicious entries from the JCR
Review and tighten permissions so only trusted authors can modify form components
Rotate any administrative session tokens that may have been exposed to the vulnerable pages

Patch Information

Adobe released fixes in Security Advisory APSB25-48 covering AEM 6.5.23 and the corresponding AEM as a Cloud Service release. Administrators should apply the vendor-supplied service pack for on-premise deployments and confirm that AEM as a Cloud Service tenants have been updated by Adobe. See Adobe Security Advisory APSB25-48 for the complete list of fixed builds and download instructions.

Workarounds

Restrict authoring permissions on form components until the patch is applied
Enforce a strict Content Security Policy that blocks inline scripts and untrusted script sources
Deploy WAF signatures that inspect form field payloads for XSS patterns
Require additional review before publishing content changes from low-privileged authors

bash

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