CVE-2026-78359 (GCVE-0-2026-78359)
Vulnerability from cvelistv5
Published
2026-10-12 06:49
Modified
2026-10-15 19:15
CWE
  • CWE-694 - Use of Multiple Resources with Duplicate Identifier
  • CWE-706 - Use of Incorrectly-Resolved Name or Reference
Summary
OTRS does not sufficiently enforce the uniqueness of customer user identities across multiple configured CustomerUser backends. When multiple backends, such as a database and LDAP, are configured, the uniqueness check for customer user email addresses is performed only within the selected backend. As a result, an authenticated user with permission to create or modify customer users may create a customer user whose email address is already assigned to a customer user in another backend. This can result in multiple customer user records representing the same communication identity. Depending on the affected workflow and backend resolution, customer-related information or email communication may subsequently be associated with or exposed to the wrong customer user. The vulnerability does not allow unauthenticated users to create customer accounts. Exploitation requires permissions to create or modify customer users. This issue affects OTRS: * 7.0.X * 8.0.X * 2023.X * 2024.X * 2025.X * 2026.X before 2026.7.X Please note that ((OTRS)) Community Edition 6.x and before are vulnerable. Products based on the ((OTRS)) Community Edition also very likely to be affected
Impacted products
Vendor Product Version
OTRS GmbH (former OTRS AG) OTRS Version: 7.0.x
Version: 8.0.x
Version: 2023.x
Version: 2024.x
Version: 2025.x
Version: 2026.x
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Show details on NVD website


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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