CVE-2025-46909: Adobe Experience Manager XSS Vulnerability

CVE-2025-46909 Overview

Adobe Experience Manager (AEM) versions 6.5.22 and earlier contain a stored Cross-Site Scripting (XSS) vulnerability tracked as CVE-2025-46909. The flaw allows a low-privileged attacker to inject malicious JavaScript into vulnerable form fields. When a victim browses the page containing the tainted field, the script executes in their browser session.

The issue is classified under [CWE-79] (Improper Neutralization of Input During Web Page Generation). Successful exploitation requires user interaction and can lead to session compromise, defacement, or redirection within the AEM authoring or delivery environment.

Critical Impact

Persistent script injection can hijack authenticated AEM sessions and pivot toward content manipulation across affected sites.

Affected Products

• Adobe Experience Manager 6.5.22 and earlier (on-premise)
• Adobe Experience Manager Cloud Service
• AEM Forms component handling user-submitted field data

Discovery Timeline

• 2025-06-10 - CVE-2025-46909 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-46909

Vulnerability Analysis

The vulnerability resides in how Adobe Experience Manager processes user-supplied input submitted through form fields. AEM stores the attacker-supplied payload server-side and renders it back to users without adequate output encoding. This produces a stored XSS condition rather than a reflected one, meaning the payload persists across sessions until an administrator removes it.

An authenticated attacker with low privileges, such as a content contributor role, can craft form field content containing JavaScript. When a legitimate user or administrator navigates to the page presenting that field, the browser interprets the injected markup and executes it under the AEM origin. The scope change indicates that the injected script can affect resources beyond the vulnerable component, including higher-privileged administrative interfaces.

Root Cause

The root cause is missing or insufficient contextual output encoding when AEM renders stored form field values into HTML responses. The application trusts previously stored data and writes it directly into the DOM without applying HTML entity encoding or a Content Security Policy strong enough to block inline execution.

Attack Vector

Exploitation follows a network-based path. The attacker authenticates to AEM with any account permitted to edit form fields, submits a payload such as an <img> tag with an onerror handler or an inline <script> element, and waits for a target user to visit the affected page. The victim's browser then executes the payload with access to cookies, tokens, and DOM contents scoped to the AEM domain.

Because no verified public proof-of-concept exists, defenders should refer to the Adobe Experience Manager Security Advisory for vendor-supplied technical context.

Detection Methods for CVE-2025-46909

Indicators of Compromise

• Form field content containing HTML tags such as <script>, <iframe>, <svg>, or event handler attributes like onerror, onload, and onmouseover.
• Outbound requests from AEM authoring users' browsers to unfamiliar domains shortly after loading form pages.
• Unexpected session token or cookie exfiltration traffic originating from authenticated AEM sessions.

Detection Strategies

• Review AEM repository nodes storing form submissions for markup characters and encoded script fragments.
• Enable and audit AEM Dispatcher and web server logs for POST requests containing suspicious payloads to form endpoints.
• Deploy Content Security Policy reporting to capture blocked inline script executions on AEM-rendered pages.

Monitoring Recommendations

• Correlate authoring account activity with sudden JavaScript-triggered network callbacks to third-party hosts.
• Alert on privilege changes or new administrative sessions created immediately after low-privileged users edit form components.
• Monitor AEM audit logs for edits to form field templates by accounts that do not typically modify shared components.

How to Mitigate CVE-2025-46909

Immediate Actions Required

• Apply the Adobe security update referenced in bulletin APSB25-48 to all on-premise AEM 6.5.x instances.
• Confirm AEM Cloud Service environments are running the patched release channel.
• Audit existing form field content and remove any stored HTML or script payloads before returning affected pages to production.

Patch Information

Adobe released fixes as part of the Adobe Experience Manager Security Advisory APSB25-48. Administrators of AEM 6.5.22 and earlier should upgrade to the next available service pack. Cloud Service customers receive the fix through Adobe's managed release pipeline.

Workarounds

• Restrict form field editing permissions to trusted content authors until patching completes.
• Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources on AEM-delivered pages.
• Deploy a web application firewall rule set to strip HTML markup from submissions to AEM form endpoints.

# Example WAF rule concept to block script tags in AEM form POST bodies
SecRule REQUEST_METHOD "@streq POST" \
  "chain,phase:2,deny,status:403,id:1046909,msg:'AEM XSS payload blocked'"
  SecRule REQUEST_BODY "@rx (?i)(<script|onerror=|onload=|javascript:)" \
    "t:none,t:urlDecodeUni"