CVE-2026-33550 in SOGo
Summary
by MITRE • 03/22/2026
SOGo before 5.12.5 does not renew the OTP if a user disables/enables it, and has a too short length (only 12 digits instead of the 20 recommended).
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Analysis
by VulDB Data Team • 03/27/2026
The vulnerability identified as CVE-2026-33550 affects SOGo versions prior to 5.12.5 and represents a significant weakness in the authentication system's one-time password implementation. This flaw manifests when users disable and subsequently re-enable their one-time password functionality, creating a scenario where the system fails to properly regenerate the authentication token. The issue extends beyond simple functionality degradation to encompass fundamental security weaknesses that could be exploited by malicious actors. The vulnerability specifically targets the token renewal mechanism within the authentication framework, leaving users potentially exposed during the transition period between disabling and re-enabling their OTP credentials.
The technical implementation flaw resides in the insufficient length of generated one-time passwords, which are limited to only 12 digits rather than the industry-standard 20-digit recommendation. This shortened length dramatically reduces the entropy available for authentication tokens, making them significantly more susceptible to brute force attacks and dictionary attacks. According to CWE-310, this represents a weakness in cryptographic key length that directly impacts the security strength of authentication mechanisms. The inadequate token length creates a predictable attack surface where adversaries can more easily guess or compute valid authentication tokens through systematic approaches.
The operational impact of this vulnerability extends beyond the immediate authentication failure during OTP enable/disable transitions. When users disable their OTP functionality and then re-enable it, they may experience authentication failures or security gaps that could allow unauthorized access to their accounts. The system's inability to properly renew tokens during this process creates a window of opportunity for attackers to exploit the system's weakness. This vulnerability aligns with ATT&CK technique T1110.003, which focuses on credential stuffing and password guessing attacks, as the reduced token entropy makes such attacks more feasible. Organizations using affected SOGo versions face increased risk of account compromise and potential data breaches.
Security practitioners should immediately implement mitigations to address this vulnerability by upgrading to SOGo version 5.12.5 or later, which resolves the OTP renewal mechanism and implements proper token length standards. Additionally, administrators should consider implementing additional authentication layers such as multi-factor authentication beyond OTP, monitoring for unusual authentication patterns, and conducting regular security assessments of authentication systems. The vulnerability demonstrates the critical importance of proper token management and cryptographic standards in maintaining secure authentication systems. Organizations should also review their incident response procedures to ensure they can quickly identify and respond to potential exploitation of this weakness, as the reduced OTP length creates an environment where automated attack tools can more effectively target authentication systems.