CVE-2026-72759: cti-transmute Conversion History Authorization Bypass Leads to Sensitive Data Disclosure After Conversion Deletion
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
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72759?
CVE-2026-72759 has a risk score of 47, indicating a moderate level of severity.
How do I fix CVE-2026-72759?
To fix CVE-2026-72759, update to the latest version of MISP cti-transmute where the authorization check has been properly implemented.
What causes CVE-2026-72759?
CVE-2026-72759 is caused by an incomplete authorization check in the conversion-history details endpoint.
What type of data exposure occurs with CVE-2026-72759?
CVE-2026-72759 may lead to sensitive data disclosure when accessing conversion history records associated with deleted conversions.
Which versions of MISP cti-transmute are affected by CVE-2026-72759?
All impacted versions of MISP cti-transmute prior to the fix introduced in the latest release are at risk for CVE-2026-72759.