A significant vulnerability discovered in Sitecore CMS exposed installations to potential unauthorized access. The flaw primarily resided within a password reset functionality that allowed attackers to perform brute-force attacks against user accounts.
Specifically, the weakness was found in the mechanism used for resetting passwords via security questions. The affected endpoint lacked sufficient validation and rate limiting, enabling malicious actors to repeatedly guess the answers to these questions. By automating this process through a brute-force script, an attacker could potentially determine the correct answers for any user account, including highly privileged ones like administrative accounts.
Once an attacker successfully reset a password using this method, they could gain complete control over the compromised account. This effectively creates a backdoor into the CMS, allowing them to manipulate content, access sensitive data, or further compromise the underlying server infrastructure. The potential impact of such a breach is substantial, ranging from website defacement and data theft to the installation of malware and significant operational disruption.
While details regarding specific affected versions are critical, the discovery highlights the paramount importance of regularly applying patching and implementing robust security mitigation strategies for all CMS platforms. Organizations utilizing the affected software were strongly advised to update their installations immediately and review security configurations to prevent exploitation of this critical issue. Proactive security measures are essential in defending against such sophisticated brute-force attacks targeting core system functionalities.
Source: https://go.theregister.com/feed/www.theregister.com/2025/06/17/sitecore_rce_vulnerabilities/
