CVE-2026-72759 in cti-transmute
Summary
by MITRE • 08/10/2026
In affected versions of MISP cti-transmute, the conversion-history details endpoint performs an incomplete authorization check. When a history record references a deleted conversion, the associated conversion lookup returns None. The previous logic only denied access when the conversion object existed and the visibility check failed. As a result, deleted conversions bypassed the authorization check and their retained history input/output could be disclosed to a user able to request the corresponding history entry. The July 22, 2026 commit changes the logic to deny access whenever the conversion is missing or the requester lacks permission
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Analysis
by VulDB Data Team • 08/10/2026
The vulnerability in MISP cti-transmute affects the conversion-history details endpoint where an incomplete authorization check allows unauthorized disclosure of historical conversion data. This flaw exists in specific versions of the software where the system fails to properly validate access permissions when processing history records that reference deleted conversions. The technical implementation contains a logical error in the authorization flow that creates a security gap through improper handling of missing conversion objects.
The core technical flaw occurs when the system attempts to lookup a conversion object that has been deleted from the database. Previously, the authorization logic only enforced access restrictions when a conversion object existed but failed visibility checks. This design creates a scenario where deleted conversions bypass the normal authorization process entirely since the lookup returns None instead of raising an appropriate exception that would trigger the access denial mechanism. The system's conditional logic does not account for the case where the conversion object is missing from the database, allowing unauthorized users to access historical input/output data through the history endpoint.
This vulnerability has significant operational impact as it enables information disclosure attacks against deleted conversion records that remain in the history database. An attacker with appropriate privileges to request history entries can potentially access sensitive data that should have been restricted due to the deletion of its associated conversion object. The exposure affects both input and output data from historical conversions, creating potential risks for data integrity and confidentiality. This type of vulnerability aligns with CWE-284 Access Control Issues where improper authorization checks lead to unauthorized access to resources.
The fix implemented in the July 22, 2026 commit addresses this by modifying the authorization logic to explicitly deny access when either the conversion object is missing or when the requester lacks proper permissions. This change ensures that all historical records undergo proper authorization validation regardless of whether their associated conversion object exists in the database. The updated implementation follows security best practices for access control enforcement and aligns with ATT&CK technique T1078 Valid Accounts where unauthorized access to system resources could be achieved through improper privilege checking.
The vulnerability demonstrates a classic case of incomplete input validation and authorization enforcement that can occur when systems fail to consider all possible states of referenced objects. Organizations using MISP cti-transmute should immediately apply the patch to prevent potential disclosure of sensitive historical conversion data, particularly in environments where conversion records may contain confidential information or be subject to regulatory compliance requirements. The fix ensures proper separation between historical data retention and access control enforcement, preventing scenarios where deleted objects could still provide unauthorized access pathways through related history entries.