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CVE-2026-47986 is a DOM-based Cross-Site Scripting (XSS) vulnerability affecting Adobe Experience Manager (AEM) versions 6.5.24, LTS SP1, 2026.04 and earlier. Unlike traditional reflected or stored XSS, DOM-based XSS arises entirely on the client side when a web application’s client‑side scripts manipulate the Document Object Model (DOM) in an unsafe manner. In AEM’s case, the application accepts attacker‑controlled input from URL parameters, fragments, or browser storage, then uses that input directly to write new HTML content into the page’s DOM without proper sanitisation.
An attacker can craft a malicious URL containing, for example, a specially designed fragment or query parameter. When a victim (who must be logged into the vulnerable AEM instance) visits this link, the browser loads a legitimate AEM page, but the client‑side JavaScript on that page reads the attacker’s payload from the DOM source (e.g., location.hash) and inserts it into the DOM sink (e.g., innerHTML). The payload executes in the context of the victim’s session, allowing the attacker to steal session tokens, perform actions on behalf of the user, or deface the page.
Exploitation requires user interaction (the victim must click the crafted link) and the attacker must be authenticated (low privileges required). The CVSS score is 5.4 (MEDIUM) with the vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. The vulnerability is considered “problematic” but no public exploit is currently available. The recommended mitigation is to upgrade to a patched version of AEM as soon as possible. Because of the low complexity and the widespread use of AEM in content‑management environments, this vulnerability poses a moderate but real risk, especially for publicly accessible instances.
DailyCVE Form:
Platform: Adobe Experience Manager Version : 6.5.24, LTS SP1, 2026.04 and earlier Vulnerability : DOM-based XSS Severity: MEDIUM (5.4) date: 2026-06-09 Prediction: Patch expected 2026-06-16
What Undercode Say:
Use curl to check for vulnerable AEM version by inspecting the response header curl -I https://your-aem-instance.com Search for unsafe DOM sinks in AEM client-side JavaScript (example using grep) grep -r "innerHTML|location.hash|document.write" /path/to/aem/clientlibs/ Monitor logs for suspicious payloads containing common XSS tokens tail -f /var/log/aem/error.log | grep -i "script|<img|onerror" Nmap script to test for DOM-based XSS (conceptual) nmap -p 443 --script http-dom-based-xss --script-args http-dom-based-xss.url=/vulnerable/page.html your-aem-instance.com
Exploit:
A simple proof‑of‑concept URL that might trigger the vulnerability if the page uses the fragment (hash) unsafely:
https://vulnerable-aem.com/page.html<img src=x onerror=alert('CVE-2026-47986')>
or using a query parameter:
https://vulnerable-aem.com/page.html?payload=<svg onload=alert(document.cookie)>
If the vulnerable AEM page reads `location.hash` or `window.location.search` and writes it into the DOM without sanitisation, the JavaScript payload will execute in the victim’s browser with the session context of the logged‑in user.
Protection:
– Upgrade AEM to version 2026.05 or newer (the official patch is included in the Adobe security bulletin APSB26-56).
– Implement a Content Security Policy (CSP) that disallows inline script execution and restricts script sources to trusted domains.
– Sanitise all DOM sinks in custom AEM client libraries; use `textContent` instead of innerHTML, and avoid using `eval()` on user‑controlled data.
– Use a Web Application Firewall (WAF) that filters for common XSS payloads, especially in URL parameters and fragments.
– Educate users not to click untrusted links that lead to the AEM instance.
Impact:
– Session Hijacking: An attacker can steal the victim’s session cookie and impersonate them, gaining access to administrative functions or sensitive content.
– Data Theft: The injected script can read any data that the victim’s browser has access to, including form data, API responses, and confidential page content.
– Privilege Escalation: A low‑privileged user (e.g., a content author) can be tricked into executing actions that require higher permissions, effectively escalating their privileges.
– Defacement and Phishing: The attacker can alter the appearance of the page or inject fake login forms to harvest credentials.
– Supply‑Chain Risk: Because AEM is often integrated with other enterprise systems, a successful XSS attack can serve as a stepping stone for further attacks on internal networks.
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Sources:
Reported By: nvd.nist.gov
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