A critical cryptographic flaw in Kentico Xperience allows unauthorized manipulation of URL hash values, which could lead to potential security bypasses or unintended system behavior.

This vulnerability involves the use of a broken or risky cryptographic algorithm (CWE-327), allowing an unauthenticated attacker to manipulate URL hash values. The flaw stems from insufficient entropy or structure in the hashing mechanism, which the vendor has addressed by adding a security layer to prevent hash reuse.

The ability to manipulate URL hash values can lead to unauthorized access to restricted content or the bypass of security controls that rely on these hashes for integrity verification. With a CVSS score of 7.5, this vulnerability represents a significant risk to the confidentiality and integrity of web applications, potentially resulting in data exposure or session manipulation.

Immediate Action: Update Kentico Xperience to the latest version or apply the specific hotfix provided by the vendor to implement the required security layer for URL hashing.

Proactive Monitoring: Monitor web server access logs for anomalous URL patterns or unexpected hash values that deviate from standard request structures.

Compensating Controls: Implement a Web Application Firewall (WAF) to detect and block suspicious traffic patterns targeting URL parameters or known application endpoints.

Public Exploit Available: No (exploit_available: false).

Given the potential for unauthorized access, organizations using Kentico Xperience must prioritize upgrading their installations to the patched versions. Applying these updates is essential to mitigating the risk of hash manipulation and ensuring the continued integrity of application URLs.