CVE-2026-79300
LowCVSS 3.5Exploitation Probability (EPSS)
Low risk12th percentile - higher than 12% of all known CVEs
Summary
SEP sesam before 5.2.0.24 mishandles User Authorization with MFA. If AD authentication is configured and MFA is enforced, an attacker can create a second OTP access capability. SEP sesam and Active Directory handle username capitalization differently, which may allow multiple SEP sesam user accounts to be created for the same Active Directory (AD) account.
Risk Assessment
Reduced effectiveness of MFA protection may allow an attacker to bypass the second authentication factor and gain unauthorized access to the SEP sesam system. This poses a significant risk to the confidentiality, integrity, and availability of the organization's data and backup infrastructure.
Recommendation
Update SEP sesam to version 5.2.0.24 or later. Additionally, review SEP sesam user accounts for duplicates differing only in letter casing and remove unnecessary accounts.
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Original NVD description (English source)
SEP sesam before 5.2.0.24 mishandles User Authorization with MFA. If AD authentication is configured and MFA is enforced, an attacker can create a second OTP access capability. SEP sesam and Active Directory handle username capitalization differently, which may allow multiple SEP sesam user accounts to be created for the same Active Directory (AD) account. Active Directory treats usernames as case-insensitive, while SEP sesam distinguishes between different letter casing. As a result, the same AD user can be represented by multiple SEP sesam user accounts that differ only in username capitalization. When Active Directory authentication is configured and multi-factor authentication (MFA) is enforced, this behavior may allow an additional OTP Authenticator to be registered for the same AD account, reducing the effectiveness of MFA protection.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS