CVE-2026-27262 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. Stored XSS occurs when malicious scripts are permanently injected into web application data fields, which are then served to users without proper sanitization or encoding. In this case, attackers can exploit vulnerable form fields within AEM to embed malicious JavaScript code. When legitimate users access pages containing these fields, the injected scripts execute in their browsers, potentially allowing attackers to steal session tokens, perform actions on behalf of users, or redirect users to malicious sites. The vulnerability has a CVSS 3.1 base score of 5.4, reflecting a medium severity with the vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. This means the attack can be performed remotely over the network with low complexity, requires some privileges (likely authenticated user access), and user interaction (visiting the malicious page). The vulnerability impacts confidentiality and integrity by enabling unauthorized script execution but does not affect system availability. No public exploits have been reported yet, but the presence of stored XSS in a widely used enterprise content management system like AEM poses a significant risk. Adobe has not yet published patches or mitigation instructions, so organizations must monitor for updates and consider interim controls.

The vulnerability allows attackers to execute arbitrary JavaScript in the context of users’ browsers when they visit compromised AEM pages, potentially leading to session hijacking, credential theft, unauthorized actions, or phishing attacks. For organizations, this can result in data breaches, loss of user trust, and compliance violations. Since AEM is widely used by enterprises for managing digital content and customer experiences, exploitation could affect sensitive corporate and customer data. The scope includes all users who access affected pages, which may include employees, partners, and customers. Although no availability impact is noted, the confidentiality and integrity risks can facilitate further attacks or data exfiltration. The requirement for some privileges and user interaction limits exploitation somewhat but does not eliminate risk, especially in environments with many authenticated users. The lack of known exploits currently reduces immediate risk but does not preclude future active exploitation.

Organizations should immediately identify and inventory all Adobe Experience Manager instances running version 6.5.23 or earlier. Until Adobe releases a patch, apply strict input validation and output encoding on all form fields to prevent script injection. Implement Content Security Policy (CSP) headers to restrict execution of unauthorized scripts in browsers. Limit user privileges to the minimum necessary to reduce the risk of privilege escalation. Monitor web application logs for unusual input patterns or script injection attempts. Educate users to avoid clicking on suspicious links or visiting untrusted pages within the AEM environment. Consider deploying Web Application Firewalls (WAFs) with rules to detect and block XSS payloads targeting AEM. Stay updated with Adobe security advisories and apply official patches promptly once available. Conduct thorough security testing of AEM customizations and integrations to identify and remediate similar vulnerabilities.