CVE-2026-48250: Adobe Experience Manager DOM-Based XSS Vulnerability (CVSS 5.4)

Technical summary

This DOM-based XSS vulnerability (CWE-79) exists in Adobe Experience Manager and can be triggered through manipulation of the Document Object Model. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) indicates network accessibility, low attack complexity, and requirement for low-privilege authenticated access plus user interaction. The scope change (S:C) means successful exploitation can affect confidentiality and integrity of resources beyond the immediate vulnerable component. This is distinct from reflected or stored XSS and may be harder to detect through standard network inspection.

Business impact

Compromised user sessions within AEM instances could lead to unauthorized data modification, theft of sensitive content managed within AEM repositories, or manipulation of digital assets and web properties managed through the platform. Organizations using AEM to manage customer-facing content face reputational risk if attackers modify published materials. The requirement for authentication and user interaction limits blast radius, but persistent attacks against administrative users could yield significant control over content systems.

Affected systems

Adobe Experience Manager versions 6.5.24, LTS SP1, and 2026.04 and earlier are affected. Organizations must inventory their AEM deployments to identify which versions are in production. The broad version range suggests this vulnerability affects both legacy and relatively recent releases, making patching coordination potentially complex for enterprises managing multiple AEM instances.

Exploitability

Exploitation requires three conditions: (1) the target must be an authenticated AEM user, (2) they must visit a malicious webpage controlled or modified by the attacker, and (3) their browser must process the crafted DOM manipulation. This is not an unauthenticated remote code execution scenario. However, once an attacker identifies a user with AEM access, phishing or watering-hole attacks become viable delivery mechanisms. The vulnerability is not currently tracked in CISA's Known Exploited Vulnerabilities catalog.

Remediation

Apply security updates from Adobe for the affected AEM versions. Since multiple version branches are affected (6.5.x, LTS SP1, and 2026.04), consult Adobe's security advisory to confirm the patched versions for your specific release line. Organizations unable to patch immediately should restrict AEM access to trusted networks, enforce strict Content Security Policy headers, and educate users not to click untrusted links while authenticated to AEM.

Patch guidance

Contact Adobe or review their official security bulletin for patched versions applicable to your deployment. Verify the patch version against Adobe's advisory before deployment. Test patches in a staging environment that mirrors production AEM configuration. Given the authentication requirement, prioritize patching instances accessible to users beyond your security team (e.g., content editors, administrators). Monitor Adobe's support portal for any patch compatibility notes with custom AEM extensions or integrations.

Detection guidance

Monitor application logs for unusual DOM manipulation or JavaScript execution patterns in AEM. Look for access logs showing authenticated users visiting unexpected external URLs or iframes within AEM interfaces. Content Security Policy violation reports can surface attempted XSS payloads. Network detection is challenging since the payload executes client-side; focus on browser-based telemetry if available. If you maintain AEM audit logs, review them for modifications made by administrative accounts around the time of suspected compromise.

Why prioritize this

Although the CVSS score is medium (5.4), this vulnerability should be prioritized based on the scope change, which indicates potential for lateral impact. Authentication and user interaction requirements reduce immediate risk, but AEM instances managing high-value digital assets or customer-facing content warrant faster remediation. Organizations with restrictive network access to AEM can defer patching slightly; those with broader user bases should patch sooner.

Risk score, explained

The CVSS 3.1 score of 5.4 (MEDIUM) reflects low attack complexity and network accessibility offset by the authentication requirement and user interaction trigger. The scope change elevates concern beyond a standard reflected XSS because the attacker's actions can affect the confidentiality and integrity of resources outside the immediate vulnerable component—potentially impacting downstream systems or other users relying on AEM-managed content. The absence of availability impact (no denial of service) keeps the score from rising higher.

Frequently asked questions