CVE-2026-47942: Adobe Experience Manager Stored XSS Vulnerability

Technical summary

CVE-2026-47942 is a stored XSS vulnerability (CWE-79) in Adobe Experience Manager affecting versions 6.5.24, LTS SP1, 2026.04 and earlier. The vulnerability exists in form field handling where input validation and output encoding are insufficient. An authenticated attacker with low-privilege credentials can inject arbitrary HTML and JavaScript into persistent storage. When a higher-privileged user or other site visitor navigates to the affected form, the stored malicious script executes with the victim's privileges in their browser context. The CVSS 3.1 score of 5.4 (MEDIUM, AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) reflects the network accessibility, low attack complexity, requirement for low privileges, need for user interaction, and changed scope—the attacker can impact resources beyond the vulnerable component.

Business impact

Stored XSS in Experience Manager poses several business risks. Attackers can deface customer-facing websites or internal portals by injecting phishing content, fake login forms, or credential-harvesting redirects. Malicious scripts can steal session cookies, steal sensitive data, or redirect users to malware distribution sites. For organizations relying on Experience Manager to serve marketing pages, e-commerce sites, or internal content, this vulnerability can erode customer trust, trigger incident response costs, and potentially violate data protection regulations if personal data is exfiltrated. The attack vector is low-friction—any low-privileged author, contractor, or compromised account can become an attack vector.

Affected systems

Adobe Experience Manager versions 6.5.24, LTS SP1, and 2026.04 (and earlier releases) are vulnerable. Organizations running these versions in production should prioritize assessment. Patched versions are available from Adobe; verify the specific patch level against Adobe's security advisory to confirm remediation.

Exploitability

Exploitation requires authentication (low-privilege user account) and user interaction (a victim must visit the page with the malicious field). The attack is not remotely exploitable without credentials, which moderates risk. However, the barrier to entry is low because many organizations grant form-editing rights to marketers, content authors, and other non-technical staff. An insider threat or compromised low-level account dramatically lowers the cost of exploitation. Once the payload is stored, it activates automatically when any user views the page—no additional attack infrastructure or zero-days needed. The vulnerability has not been added to CISA's Known Exploited Vulnerabilities catalog, though this may reflect recency rather than absence of threat activity.

Remediation

Apply the latest security patch from Adobe for your affected Experience Manager version. Adobe will provide specific patch versions in their security advisory; verify the version number before deployment. Test the patch in a staging environment given the critical role Experience Manager often plays in content delivery. Additionally, implement input validation and output encoding best practices in custom form handlers, and consider restricting form-editing permissions to trusted personnel only. Monitor form field modifications and content changes for unauthorized activity.

Patch guidance

Check Adobe's official security advisory for the patched version number corresponding to your current Experience Manager release (6.5.24, LTS SP1, or 2026.04). Apply patches to all instances, including development and staging environments where attackers may test payloads before targeting production. Prioritize production systems serving public-facing content. Schedule patching promptly—while CVSS is MEDIUM, the scope change and prevalence of Experience Manager in digital marketing infrastructure justify early action. Coordinate with content teams to avoid disruption to publishing workflows.

Detection guidance

Search for unusual JavaScript or event handler patterns in form field values within your Experience Manager instances (e.g., `<script>`, `onerror=`, `onload=`, `onclick=`). Enable and review access logs for form modification events, especially by accounts with unusual editing patterns or privilege escalations. Monitor web server logs for HTTP requests to pages containing injected forms—anomalous client-side redirect chains or new script inclusions may signal exploitation. Implement Content Security Policy (CSP) headers to restrict inline script execution. Regularly audit the list of users with form-editing permissions and disable accounts no longer requiring those rights.

Why prioritize this

Prioritize this vulnerability because it affects a strategic application (Experience Manager) used by marketing and content teams, requires only low-level credentials, and delivers persistent payload delivery to victims. While the CVSS score is MEDIUM and scope is limited by the authentication requirement, the broad user base with edit permissions and high visibility of public-facing content make this a practical threat. The absence of KEV listing does not indicate low real-world risk; it may reflect the recency of disclosure.

Risk score, explained

CVSS 5.4 (MEDIUM) reflects a balance of mitigating and aggravating factors. Mitigating: requires low-privilege authentication and user interaction. Aggravating: network-accessible, low attack complexity, changed scope (attacker can affect confidentiality and integrity of resources beyond the vulnerable component), and applicable to a widely-used platform. The scope change elevates risk—an attacker can compromise session integrity or escalate within the application. For organizations with high volumes of external visitors or sensitive content, the effective risk is higher than the numeric score suggests.

Frequently asked questions