CVE-2026-56422

Multiple MISP core controllers and model capture paths accepted client-controlled request fields such as primary keys (id) and ownership/scope foreign keys (event_id, org_id, user_id, sharing_group_id, galaxy_cluster_uuid, organisation_uuid, and related nested object identifiers) without consistently stripping, pinning, or revalidating them against the server-authorized object. In affected paths, an authenticated user with access to one authorized object could submit crafted REST or form payloads that caused MISP to save data against a different object than the one checked by the authorization logic. Depending on the endpoint, this could allow object overwrite, object re-parenting, ownership transfer, unauthorized sharing-group scoping, event/object injection, proposal retargeting, or stored attacker-controlled content appearing in another user’s context. The fixes harden affected create/edit/import flows by stripping client-supplied primary keys on create-only saves, re-pinning route- or database-authorized identifiers before save operations, validating effective sharing-group scope, and adding field whitelists where ownership fields must never be editable. The initial broad fix also added a central CRUDComponent::edit() primary-key re-pin so payload-supplied IDs cannot redirect saves away from the already-authorized row. GitHub’s patch for 7acf8220c describes this central issue as CRUDComponent::edit() copying supplied fields, including a payload primary key, onto the loaded record, allowing CakePHP save() to update an arbitrary row unless the loaded ID is re-pinned.

• https://github.com/MISP/MISP/commit/00b2e3dae56fa24ea750eb525cc4709b7e5bee85
• https://github.com/MISP/MISP/commit/025f711506850aadb69cde1b57e5e5d57628c87f
• https://github.com/MISP/MISP/commit/05aad418c57bb78e6b58a843d70d45de8f50db45
• https://github.com/MISP/MISP/commit/2cc26f38f3e85c594957899f09043d5193146607
• https://github.com/MISP/MISP/commit/3ff6bd9cfdab5d41b4667ea7298d88ffd6f3fcb8
• https://github.com/MISP/MISP/commit/57433015815e59db5a1f11536f90920952cf3fcd
• https://github.com/MISP/MISP/commit/58f637aaab4d133e72f1454ebb963191d96d3b78
• https://github.com/MISP/MISP/commit/634f1f87c295193486c08c2c7ba1fee8a7339baa
• https://github.com/MISP/MISP/commit/63aebc27a878233b9475c742985aaef909bc755b
• https://github.com/MISP/MISP/commit/7acf8220cafac58bcfb362da37aca512fe4bb396
• https://github.com/MISP/MISP/commit/8311427c2edd72a8341f0a65e1f11073d7ad9191
• https://github.com/MISP/MISP/commit/84bafe69f5d0ab7f811371c0801a613f271ebc0b
• https://github.com/MISP/MISP/commit/9341690e9b6dde7f0605edea5533e05ba7362e35
• https://github.com/MISP/MISP/commit/ab9619dfa6cb5210fd20fb3b0b57006e4fc93916
• https://github.com/MISP/MISP/commit/bc182d55dde5686a36ca2eb88fe6c2adabb9fad9
• https://github.com/MISP/MISP/commit/c80a3533b3d787f45f5185a4621cc0f05b0cf2e5