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Intro – How CVE-2026-47987 Works
This DOM-based Cross-Site Scripting (XSS) vulnerability exists in Adobe Experience Manager (AEM) versions 6.5.24, LTS SP1, 2026.04, and earlier. Unlike reflected or stored XSS, DOM-based XSS does not rely on the server injecting malicious payloads into the HTTP response. Instead, the vulnerability arises when client-side JavaScript code in AEM’s administrative interface or published content improperly handles user-controllable data from the DOM (e.g., document.location, document.referrer, window.name, or URL parameters). An attacker crafts a malicious webpage or a specially crafted link that, when visited by an authenticated AEM user (or any victim with a vulnerable session), modifies the DOM environment in the victim’s browser. The AEM JavaScript then reads this tainted data and writes it to a sink that executes code, such as eval(), innerHTML, or document.write(), without proper sanitization. Because the payload never reaches the server, traditional WAF or server-side input validation cannot block it. The attack requires user interaction – the victim must click the malicious link or visit the attacker-controlled page. Once triggered, the attacker’s JavaScript runs in the context of the victim’s browser with the same origin and privileges as the AEM application. This allows session hijacking, stealing sensitive documents, performing unauthorized actions on behalf of the victim, or defacing AEM content. The CVSS scope is changed (S:C) because the vulnerable component (client-side DOM handling) impacts a different security domain (the user’s browser and its interaction with AEM). Adobe assigned CVSS base score 5.4 (Medium) with vector: AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. Exploitation is network-based, low complexity, requires low-privileged user (any authenticated AEM user), but needs user interaction. The impact is low on confidentiality and integrity, with no availability impact, but the scope change means the vulnerable code can affect resources beyond its original privilege level.
DailyCVE Form
Platform: Adobe Experience Manager
Version: 6.5.24 and earlier
Vulnerability: DOM-based XSS
Severity: Medium
date: 06/09/2026
Prediction: 23 June 2026
What Undercode Say – Analytics
Check for vulnerable AEM client-side libraries (e.g., /etc/clientlibs/)
curl -k -s -o- "https://target-aem.com/libs/granite/ui/components/coral/foundation/page/page.jsp" | grep -E "location.hash|document.write|eval("
Simulate DOM sink monitoring with a headless browser (requires Node.js + Puppeteer)
node -e "const puppeteer=require('puppeteer'); (async()=>{const b=await puppeteer.launch();const p=await b.newPage();await p.goto('https://target-aem.com');await p.evaluate(()=>{const origWrite=document.write;document.write=function(s){console.log('DOM write:',s);origWrite.call(document,s)};});await p.waitForTimeout(5000);await b.close();})();"
Grep AEM logs for suspicious user-agent or referrer-based XSS attempts
grep -E "Referer:.<script|User-Agent:.%3Cscript" /opt/aem/crx-quickstart/logs/request.log
Exploit
Attacker hosts a malicious HTML page containing an iframe or popup that modifies `window.location.hash` or `document.referrer` to inject <img src=x onerror=alert('XSS')>. When a logged-in AEM user clicks the crafted link, the AEM JavaScript reads the malicious hash and writes it unsafely into the DOM (e.g., via `innerHTML` of a status panel). The payload executes, stealing the user’s `JSESSIONID` or performing actions like creating admin users.
Protection
Upgrade AEM to version 2026.05 or later where Adobe fixed DOM sinks. Apply Content Security Policy (CSP) with `script-src ‘self’` and `’unsafe-inline’` disabled. Use client-side sanitizers (e.g., DOMPurify) on all DOM-write operations. Enable X-XSS-Protection: 1; mode=block. Regularly audit AEM clientlibs for innerHTML, insertAdjacentHTML, and `eval()` usage.
Impact
An attacker can execute arbitrary JavaScript in victim’s browser, leading to session hijacking, unauthorized access to AEM assets, defacement of published pages, and theft of sensitive form data. Because scope is changed, the malicious script can affect higher-privileged areas (e.g., admin console) even if the initial victim has low privileges.
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Sources:
Reported By: nvd.nist.gov
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