MISP up to 2.5.39 SharingGroupsController.php create ID authorization

Summaryinfo

A vulnerability identified as critical has been detected in MISP up to 2.5.39. The affected element is the function create of the file app/Controller/SharingGroupsController.php. The manipulation of the argument ID leads to authorization. This vulnerability is listed as CVE-2026-54360. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in MISP up to 2.5.39. It has been rated as critical. This issue affects the function create of the file app/Controller/SharingGroupsController.php. The manipulation of the argument id with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A mass assignment vulnerability exists in MISP’s sharing group creation endpoint. When creating a new sharing group, the controller did not remove a user-supplied id field before saving the submitted data. In CakePHP, supplying a primary key in the save data can cause a create() followed by save() operation to update an existing record instead of creating a new one. An authenticated user with permission to add sharing groups could therefore submit the identifier of an existing sharing group and modify that sharing group without passing the normal edit access-control checks. This may allow the attacker to take over or alter sharing groups they do not otherwise have access to, potentially affecting the confidentiality and integrity of information shared through those groups. Affected component: app/Controller/SharingGroupsController.php, add() action

The weakness was presented by Jeroen Pinoy as 687e7cb530ae0e2faaadf5e3e44712258fb3ef1b. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-54360 since 06/12/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available.

By approaching the search of inurl:app/Controller/SharingGroupsController.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.5.40 eliminates this vulnerability. Applying the patch 687e7cb530ae0e2faaadf5e3e44712258fb3ef1b is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-36552). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• MISP

Version

• 2.5.0
• 2.5.1
• 2.5.2
• 2.5.3
• 2.5.4
• 2.5.5
• 2.5.6
• 2.5.7
• 2.5.8
• 2.5.9
• 2.5.10
• 2.5.11
• 2.5.12
• 2.5.13
• 2.5.14
• 2.5.15
• 2.5.16
• 2.5.17
• 2.5.18
• 2.5.19
• 2.5.20
• 2.5.21
• 2.5.22
• 2.5.23
• 2.5.24
• 2.5.25
• 2.5.26
• 2.5.27
• 2.5.28
• 2.5.29
• 2.5.30
• 2.5.31
• 2.5.32
• 2.5.33
• 2.5.34
• 2.5.35
• 2.5.36
• 2.5.37
• 2.5.38
• 2.5.39

License

• open-source

Website

• Product: https://github.com/MISP/MISP/

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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