CVE-2025-2746

The authentication bypass vulnerability in Kentico Xperience arises from improper handling of empty SHA1 usernames during the digest authentication process. This flaw allows an attacker to bypass authentication mechanisms, potentially gaining unauthorized access to administrative functionalities. The issue is particularly concerning as it enables attackers to manipulate administrative objects, which could lead to further exploitation of the system. The vulnerability is present in versions of Xperience up to 13.0.172, making it critical for organizations using this content management system to address the issue promptly.

Attack vectors for this vulnerability are relatively straightforward, as they exploit the weaknesses in the password handling mechanism. An attacker could craft a request that leverages the empty SHA1 username, allowing them to authenticate without valid credentials. This could be executed remotely, making the attack feasible for individuals with malicious intent who may not require physical access to the system. Exploitation scenarios could include gaining access to sensitive data, altering website content, or even deploying malware through administrative controls. Given the nature of the vulnerability, the potential for widespread damage is significant, particularly for organizations that rely heavily on Kentico Xperience for their web presence.

The real-world impact of this vulnerability can be severe, especially for businesses that handle sensitive information or operate in regulated industries. Unauthorized access to administrative controls can lead to data breaches, loss of customer trust, and potential legal ramifications. The risk is compounded by the high CVSS score of 9.8, indicating that the vulnerability poses a critical threat to the integrity and confidentiality of affected systems. Organizations may face financial losses due to remediation efforts, reputational damage, and regulatory fines if they fail to protect their systems adequately.

To detect and mitigate this vulnerability, organizations should implement a multi-faceted approach. Regular security assessments and penetration testing can help identify potential weaknesses in the authentication mechanisms. Additionally, monitoring logs for unusual access patterns or failed authentication attempts can provide early warning signs of exploitation attempts. Organizations should also ensure that they are running the latest version of Kentico Xperience, applying patches and updates as they become available. Furthermore, implementing additional layers of security, such as two-factor authentication, can help mitigate the risks associated with authentication bypass vulnerabilities.

In conclusion, the authentication bypass vulnerability in Kentico Xperience presents a significant threat to organizations utilizing this platform. The ease of exploitation and potential for severe consequences necessitate immediate attention and action. By understanding the technical details, recognizing the attack vectors, assessing the real-world impact, and employing effective detection and mitigation strategies, organizations can better protect themselves against this critical vulnerability. It is essential for businesses to remain vigilant and proactive in their cybersecurity efforts to safeguard their digital assets and maintain the trust of their customers.

CSURFACE threat intelligence has detected a marked escalation in activity related to CVE-2025-2746, with initial sightings emerging after a period of dormancy. This uptick signals that threat actors may be actively probing or attempting to exploit the authentication bypass vulnerability in Kentico Xperience, increasing the likelihood of successful intrusions targeting administrative controls. Although no new exploit variants or ransomware affiliations have been identified, the elevated detection trend underscores a growing operational interest that could precede more widespread exploitation attempts. The current EPSS score remains high and stable, reflecting sustained exploitability and risk. Consequently, this development elevates the urgency for defenders to enhance monitoring and response capabilities around affected systems, as the window for potential compromise is narrowing and the impact of a breach remains critical.

Update 2 — June 23, 2026

CSURFACE threat intelligence has identified a marked escalation in detection activity related to CVE-2025-2746, indicating increased adversary engagement despite a concurrent decline in the EPSS score. This divergence suggests that while exploit attempts are becoming more frequent, the overall likelihood of successful exploitation or widespread adoption may be diminishing, potentially due to improved defensive measures or shifting attacker priorities. The inclusion of this vulnerability in the KEV catalog further elevates its profile within the security community, signaling heightened awareness and prioritization for patching and monitoring efforts. For defenders, the surge in observed activity underscores the necessity to maintain vigilant detection capabilities around Kentico Xperience environments, as attackers continue to probe administrative controls via this authentication bypass. Although no new exploit variants or ransomware affiliations have emerged, the evolving exploitation pattern warrants close observation to anticipate any escalation or integration into broader attack campaigns. Consequently, the threat level remains critical, with the increased operational interest reinforcing the urgency to track and respond to exploitation attempts promptly.