CVE-2021-47712 in Xperience
Summary
by MITRE • 12/18/2025
A cryptography vulnerability in Kentico Xperience allows attackers to potentially manipulate URL hash values through existing hashing mechanisms. The hotfix introduces an additional security layer to prevent hash value reuse and potential exploitation.
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Analysis
by VulDB Data Team • 12/18/2025
The cryptography vulnerability identified as CVE-2021-47712 affects Kentico Xperience, a comprehensive content management and e-commerce platform that serves thousands of organizations worldwide. This vulnerability resides within the platform's URL hashing mechanisms, which are critical for maintaining application security and user authentication integrity. The flaw represents a significant concern for organizations relying on Kentico Xperience for their digital presence, as URL hashes are commonly used for session management, access control, and data integrity verification within web applications.
The technical flaw manifests in the insufficient protection mechanisms surrounding URL hash generation and validation processes. Attackers can potentially manipulate existing hash values through predictable patterns or by exploiting weaknesses in the current hashing algorithms. This vulnerability stems from inadequate entropy in hash generation, allowing malicious actors to craft or reuse hash values that would normally be unique and time-bound. The vulnerability aligns with CWE-327, which addresses broken or weak cryptographic algorithms, and specifically targets cryptographic weaknesses in hash functions that should prevent replay attacks and unauthorized access.
The operational impact of CVE-2021-47712 extends beyond simple data integrity concerns to encompass potential unauthorized access and privilege escalation within Kentico Xperience environments. Attackers exploiting this vulnerability could manipulate session tokens, bypass access controls, or gain unauthorized administrative privileges. The risk is particularly elevated in environments where URL hashes are used for sensitive operations such as user authentication, content management access, or administrative functions. This vulnerability could enable attackers to perform actions that would normally require legitimate authentication credentials, creating a significant attack surface that could compromise entire applications.
Organizations should implement immediate mitigations including applying the vendor-provided hotfix that introduces additional security layers to prevent hash value reuse and potential exploitation. The recommended approach involves strengthening the hashing mechanisms with cryptographically secure random number generators and implementing proper hash validation procedures. Security teams should also conduct thorough audits of existing URL hash usage patterns and implement monitoring solutions to detect anomalous hash value patterns. According to ATT&CK framework tactic TA0006 (Credential Access), this vulnerability could enable adversaries to escalate privileges through compromised session management mechanisms, making immediate remediation critical. Organizations should also consider implementing additional controls such as rate limiting, IP whitelisting, and enhanced logging of hash-related activities to detect potential exploitation attempts. The vulnerability demonstrates the importance of proper cryptographic implementation in web applications and underscores the need for continuous security assessment of authentication mechanisms within content management systems.