Platform
other
Component
aem-inbox-module
Fixed in
6.5.6
6.4.9
6.3.4
CVE-2020-9742 describes a stored Cross-Site Scripting (XSS) vulnerability within the Adobe Experience Manager (AEM) Inbox module. This vulnerability allows authenticated users with 'Author' privileges to inject malicious scripts into fields associated with the Inbox calendar feature. Successful exploitation can lead to the execution of arbitrary JavaScript code in the context of other users' browsers, potentially compromising sensitive data and system integrity. The vulnerability impacts AEM versions 6.5.5.0 and below, 6.4.8.1 and below, and 6.3.3.8 and below; Adobe has not released a fixed version as of this writing.
The impact of CVE-2020-9742 is significant due to the potential for remote code execution within the AEM environment. An attacker could leverage this vulnerability to steal session cookies, redirect users to malicious websites, deface web pages, or even gain control of the AEM server. The 'Author' privilege level, while not the highest, grants considerable access within AEM, making this a high-risk vulnerability. The stored nature of the XSS means the malicious script persists until removed, allowing for repeated exploitation. This vulnerability shares similarities with other XSS vulnerabilities where user-supplied data is not properly sanitized before being rendered in a web page, potentially leading to account takeover and data breaches.
CVE-2020-9742 was publicly disclosed on September 10, 2020. While no active exploitation campaigns have been definitively confirmed, the vulnerability's criticality and ease of exploitation make it a likely target. The vulnerability is not currently listed on CISA KEV. Public proof-of-concept exploits are available, increasing the risk of widespread exploitation. The NVD entry was created on the same date as the public disclosure.
Exploit Status
EPSS
0.87% (75% percentile)
CVSS Vector
Due to the lack of a fixed version, immediate mitigation strategies are crucial. First, restrict access to the Inbox calendar feature to only essential users. Implement strict input validation and sanitization on all user-supplied data within the Inbox module. Consider using a Web Application Firewall (WAF) with rules to detect and block XSS payloads targeting the calendar fields. Regularly scan the AEM environment for XSS vulnerabilities using automated tools. While not a complete solution, temporarily disabling the Inbox calendar feature can significantly reduce the attack surface. After implementing these mitigations, thoroughly test the AEM environment to ensure functionality remains intact and no new vulnerabilities have been introduced.
Update Adobe Experience Manager to a version later than 6.5.5.0, 6.4.8.1 or 6.3.3.8, as appropriate for your current version. This will resolve the stored XSS vulnerability in the Inbox module.
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CVE-2020-9742 is a critical stored XSS vulnerability in Adobe Experience Manager's Inbox module, allowing attackers with 'Author' privileges to inject malicious scripts into calendar fields, potentially leading to code execution.
You are affected if you are using AEM versions 6.5.5.0 and below, 6.4.8.1 and below, or 6.3.3.8 and below and have users with 'Author' privileges accessing the Inbox calendar feature.
As of now, there's no official patch. Mitigate by restricting access, implementing input validation, using a WAF, and temporarily disabling the Inbox calendar feature.
While no confirmed active campaigns are publicly known, the vulnerability's criticality and available PoCs suggest a high likelihood of exploitation.
Refer to the Adobe Security Bulletin for CVE-2020-9742: https://www.adobe.com/security/advisories/adv20-273.html
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