CVE-2026-56451 in Opcenter X
Summary
by MITRE • 07/14/2026
A vulnerability has been identified in Opcenter X (All versions < V2604). Affected applications do not properly validate the algorithm specified in the JSON Web Token (JWT) header. This could allow an unauthenticated remote attacker to forge arbitrary JWT, bypass authentication mechanisms and impersonate any user including administrative accounts, potentially gaining full unauthorized access to the application.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability exists within Opcenter X software versions prior to V2604 where the application fails to properly validate cryptographic algorithms specified in JSON Web Token headers. The flaw represents a critical security weakness that directly impacts the integrity of authentication mechanisms by allowing attackers to manipulate JWT signatures through algorithm substitution attacks. When applications do not rigorously verify the algorithm field in JWT headers, they become susceptible to attacks where malicious actors can change the algorithm from a secure signature method like RS256 to a simple signing algorithm such as HS256 that uses symmetric key cryptography. This vulnerability enables unauthenticated remote attackers to forge arbitrary JSON Web Tokens without possessing the legitimate signing keys required for proper authentication validation.
The technical exploitation of this vulnerability occurs through manipulation of the JWT header field where the algorithm parameter is specified. Attackers can substitute the expected asymmetric algorithm with a symmetric one, causing the application to accept tokens signed with a simple hash function rather than requiring proper cryptographic signatures. This misconfiguration allows attackers to generate valid-looking tokens that bypass authentication checks entirely, as the system accepts the forged tokens due to insufficient algorithm validation. The vulnerability specifically relates to CWE-347 known as "Improper Verification of Cryptographic Signature" which occurs when applications fail to properly validate digital signatures or cryptographic operations.
The operational impact of this vulnerability is severe and potentially catastrophic for affected systems. An attacker who successfully exploits this weakness can impersonate any user account including administrative privileges, thereby gaining full unauthorized access to the application and its underlying resources. This includes potential data exfiltration, privilege escalation, system compromise, and unauthorized modification of critical application functionality. The ability to forge tokens means that attackers can move laterally within the system, access sensitive information, and perform operations that should only be available to authorized users with proper authentication credentials.
Organizations should immediately implement mitigations including updating to Opcenter X version V2604 or later which contains proper JWT algorithm validation mechanisms. Additionally, security teams must ensure that applications validate the algorithm field in JWT headers against a whitelist of approved cryptographic methods and reject any tokens using insecure algorithms such as HS256 when asymmetric signing is expected. The implementation should follow established security frameworks like NIST SP 800-57 for cryptographic key management and adhere to secure coding practices outlined in OWASP Top 10. Organizations should also consider implementing monitoring solutions that detect unusual JWT usage patterns and employ proper token lifecycle management including short expiration times and regular token rotation to minimize potential damage from any successful exploitation attempts.