CVE-2025-64888: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64888 is a DOM-based Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager (AEM) that allows a low-privileged attacker to execute malicious scripts in the context of a victim's browser. It affects AEM versions 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, and patched 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), specifically of the DOM-based variant. An authenticated low-privileged attacker can craft a malicious URL or manipulate a web page such that unsanitized input is processed by the victim's browser DOM, triggering script execution without server-side reflection. Exploitation requires user interaction — the victim must visit a crafted URL or interact with a manipulated page. No public proof-of-concept code has been identified at this time (Adobe Advisory).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session within AEM, potentially leading to session token theft, credential harvesting, unauthorized actions performed on behalf of the victim, or redirection to malicious sites. The scope is changed (S:C in CVSS), meaning the impact extends beyond the vulnerable component to the victim's browser context. Confidentiality and integrity are both assessed as low impact, with no direct availability impact (Adobe Advisory).

1. Reconnaissance: Identify AEM instances running versions 6.5.23 or earlier, or AEM Cloud Service prior to 2025.12.0, using web fingerprinting tools or Shodan searches for AEM-specific paths (e.g., /libs/granite/core/content/login.html).
2. Obtain low-privileged access: Register or obtain credentials for a low-privileged AEM user account (e.g., a contributor or author role).
3. Craft malicious payload: Construct a URL or web page that injects a DOM-based XSS payload into an AEM parameter or fragment that is processed client-side without sanitization.
4. Deliver to victim: Send the crafted URL to a higher-privileged AEM user (e.g., administrator) via phishing, social engineering, or embedding in AEM content.
5. Achieve script execution: When the victim visits the crafted URL or interacts with the manipulated page, the malicious JavaScript executes in their browser context, enabling session token theft, unauthorized AEM actions, or further attacks (Adobe Advisory).

• Network: Unusual outbound requests from victim browsers to attacker-controlled domains following AEM page interactions; unexpected cross-origin requests originating from AEM pages.
• Logs: AEM access logs showing requests to AEM endpoints with suspicious URL fragments or query parameters containing encoded JavaScript (e.g., <script>, javascript:, onerror=, onload=).
• Browser/Session: Unexpected session token usage from unfamiliar IP addresses or user agents after a user interacted with an AEM page; unauthorized content modifications in AEM authored by a victim's account.
• Application: Newly created or modified AEM content containing embedded script tags or event handler attributes not authored by legitimate users.

Adobe has released patches addressing CVE-2025-64888 as part of security bulletin APSB25-115. Users should upgrade AEM on-premises to version 6.5.24.0 or later, and AEM Cloud Service customers should ensure their environment is updated to the 2025.12.0 release or later. No specific configuration-based workaround has been published; upgrading to the patched version is the recommended remediation. Organizations should also enforce the principle of least privilege for AEM user accounts to reduce the risk of exploitation (Adobe Advisory).

The Center for Internet Security (CIS) issued an advisory noting multiple vulnerabilities in Adobe products patched in December 2025, including those addressed in APSB25-115. Tenable also flagged the vulnerability in its plugin pipeline. No significant independent researcher commentary or social media discussion specific to CVE-2025-64888 has been identified, consistent with its medium severity rating and lack of active exploitation (CIS Advisory).