Cross-site Scripting Vulnerability in Commenting Function of Adobe Experience Manager (AEM)

Successful exploitation of CVE-2020-24445 allows an attacker to inject arbitrary JavaScript code into AEM pages. When a user visits a page containing the injected script, the malicious code will execute within their browser context. This could lead to various attacks, including session hijacking, credential theft, defacement of the website, and redirection to malicious sites. The impact is particularly severe because XSS vulnerabilities can be exploited without requiring authentication, potentially affecting all users of the affected AEM instance. The stored nature of the XSS means the injected script persists until removed, allowing for repeated exploitation.

Organizations using Adobe Experience Manager Cloud Service or versions 6.5.6.0 and earlier are at risk. This includes businesses relying on AEM for content management, digital asset management, and website personalization. Shared hosting environments utilizing AEM are particularly vulnerable, as a compromised tenant could potentially inject malicious scripts affecting other tenants.

• adobe: Examine AEM logs for unusual JavaScript execution patterns or suspicious form submissions. Look for POST requests containing <script> tags or event handlers.

Get-WinEvent -LogName Application -FilterXPath "*[System[Provider[@Name='AEM']]] and Event[Level='Error']" | Select-String -Pattern '<script>' -Context 2,2

• generic web: Monitor access logs for requests containing suspicious characters or patterns commonly associated with XSS attacks (e.g., <script>, onerror=, javascript:).

grep -i '<script>' /var/log/apache2/access.log

1. 2020-12-10Disclosure

   disclosure

1. Reserviert2020-08-19
2. Veröffentlicht2020-12-10
3. Geändert2024-09-17
4. EPSS aktualisiert2026-04-02

The primary mitigation for CVE-2020-24445 is to upgrade to a patched version of Adobe Experience Manager. Adobe recommends upgrading to a version that includes the fix for this vulnerability. If immediate upgrade is not possible, consider implementing input validation and output encoding on all user-supplied data to prevent malicious scripts from being injected. Web Application Firewalls (WAFs) configured to detect and block XSS attacks can also provide a temporary layer of protection. Carefully review and sanitize all form fields and user input within AEM.