CVE-2023-40176
CriticalCVSS 9.0Exploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
XWiki Platform has a stored XSS vulnerability that can be exploited by registered users by setting a malicious payload in the time zone user preference. Although the time zone is selected from a dropdown, it can still be set using JavaScript or the appropriate URL.
Risk Assessment
An attacker can execute malicious code in the context of other users' browsers, leading to information theft and potential escalation of privileges.
Recommendation
It is recommended to upgrade to XWiki version 14.10.5 or 15.1RC1 to mitigate this vulnerability.
Original NVD description (English source)
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Any registered user can exploit a stored XSS through their user profile by setting the payload as the value of the time zone user preference. Even though the time zone is selected from a drop down (no free text value) it can still be set from JavaScript (using the browser developer tools) or by calling the save URL on the user profile with the right query string. Once the time zone is set it is displayed without escaping which means the payload gets executed for any user that visits the malicious user profile, allowing the attacker to steal information and even gain more access rights (escalation to programming rights). This issue is present since version 4.1M2 when the time zone user preference was introduced. The issue has been fixed in XWiki 14.10.5 and 15.1RC1.