Netflix Lemur up to 1.9.1 PUT handler lemur/roles/views.py privileges management

Summaryinfo

A vulnerability labeled as critical has been found in Netflix Lemur up to 1.9.1. The impacted element is an unknown function of the file lemur/roles/views.py of the component PUT handler. The manipulation results in privileges management. This vulnerability is identified as CVE-2026-55163. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Netflix Lemur up to 1.9.1. Affected is an unknown part of the file lemur/roles/views.py of the component PUT handler. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Lemur manages TLS certificate creation. Prior to 1.9.2, PUT /api/1/roles/ in lemur/roles/views.py:298 authorized updates with RoleMemberPermission(role_id), which allowed either an administrator or any existing member of the target role. The handler passed data["users"] and data["name"] to service.update, allowing a non-admin member to add or remove other users and rename the role. This enabled lateral privilege grants within roles that control certificate and authority access and could deny access by removing legitimate members. The DELETE handler already required admin_permission, confirming that the weaker PUT authorization was inconsistent. The fix applies the same administrator-only requirement to the PUT handler. This issue is fixed in version 1.9.2.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-55163 since 06/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 1.9.2 eliminates this vulnerability.

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Productinfo

Vendor

• Netflix

Name

• Lemur

Version

• 1.9.0
• 1.9.1

Website

• Product: https://github.com/Netflix/lemur/

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