{"id":"CVE-2026-56422","state":"PUBLISHED","title":"MISP Core: Mass Assignment and Object Re-ownership via Unvalidated Request Fields","description":"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.\n\nIn 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.\n\nThe 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.","publishedAt":"2026-06-22T11:43:02.690Z","updatedAt":"2026-06-23T05:58:54.059Z","severity":{"score":9.4,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","source":"CIRCL"},"assigner":"CIRCL","products":["misp misp"],"affected":[{"vendor":"misp","product":"misp","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.5.41","versionType":"semver"}],"repo":"https://github.com/misp/misp"}],"references":["https://github.com/MISP/MISP/commit/7acf8220cafac58bcfb362da37aca512fe4bb396","https://github.com/MISP/MISP/commit/bc182d55dde5686a36ca2eb88fe6c2adabb9fad9","https://github.com/MISP/MISP/commit/58f637aaab4d133e72f1454ebb963191d96d3b78","https://github.com/MISP/MISP/commit/05aad418c57bb78e6b58a843d70d45de8f50db45","https://github.com/MISP/MISP/commit/63aebc27a878233b9475c742985aaef909bc755b","https://github.com/MISP/MISP/commit/00b2e3dae56fa24ea750eb525cc4709b7e5bee85","https://github.com/MISP/MISP/commit/634f1f87c295193486c08c2c7ba1fee8a7339baa","https://github.com/MISP/MISP/commit/ab9619dfa6cb5210fd20fb3b0b57006e4fc93916","https://github.com/MISP/MISP/commit/8311427c2edd72a8341f0a65e1f11073d7ad9191","https://github.com/MISP/MISP/commit/c80a3533b3d787f45f5185a4621cc0f05b0cf2e5","https://github.com/MISP/MISP/commit/025f711506850aadb69cde1b57e5e5d57628c87f","https://github.com/MISP/MISP/commit/3ff6bd9cfdab5d41b4667ea7298d88ffd6f3fcb8","https://github.com/MISP/MISP/commit/84bafe69f5d0ab7f811371c0801a613f271ebc0b","https://github.com/MISP/MISP/commit/2cc26f38f3e85c594957899f09043d5193146607","https://github.com/MISP/MISP/commit/57433015815e59db5a1f11536f90920952cf3fcd","https://github.com/MISP/MISP/commit/9341690e9b6dde7f0605edea5533e05ba7362e35"],"weaknesses":["CWE-639"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/56xxx/CVE-2026-56422.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-56422","state":"PUBLISHED","datePublished":"2026-06-22T11:43:02.690Z","dateUpdated":"2026-06-23T05:58:54.059Z","assignerShortName":"CIRCL","assignerOrgId":"5a6e4751-2f3f-4070-9419-94fb35b644e8","dateReserved":"2026-06-22T11:42:55.345Z"},"containers":{"cna":{"title":"MISP Core: Mass Assignment and Object Re-ownership via Unvalidated Request Fields","descriptions":[{"lang":"en","value":"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.\n\nIn 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.\n\nThe 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."}],"affected":[{"vendor":"misp","product":"misp","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.5.41","versionType":"semver"}],"repo":"https://github.com/misp/misp"}],"references":[{"url":"https://github.com/MISP/MISP/commit/7acf8220cafac58bcfb362da37aca512fe4bb396","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/bc182d55dde5686a36ca2eb88fe6c2adabb9fad9","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/58f637aaab4d133e72f1454ebb963191d96d3b78","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/05aad418c57bb78e6b58a843d70d45de8f50db45","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/63aebc27a878233b9475c742985aaef909bc755b","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/00b2e3dae56fa24ea750eb525cc4709b7e5bee85","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/634f1f87c295193486c08c2c7ba1fee8a7339baa","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/ab9619dfa6cb5210fd20fb3b0b57006e4fc93916","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/8311427c2edd72a8341f0a65e1f11073d7ad9191","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/c80a3533b3d787f45f5185a4621cc0f05b0cf2e5","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/025f711506850aadb69cde1b57e5e5d57628c87f","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/3ff6bd9cfdab5d41b4667ea7298d88ffd6f3fcb8","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/84bafe69f5d0ab7f811371c0801a613f271ebc0b","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/2cc26f38f3e85c594957899f09043d5193146607","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/57433015815e59db5a1f11536f90920952cf3fcd","tags":["patch"]},{"url":"https://github.com/MISP/MISP/commit/9341690e9b6dde7f0605edea5533e05ba7362e35"}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.4,"baseSeverity":"CRITICAL","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","description":"CWE-639 Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CIRCL","orgId":"5a6e4751-2f3f-4070-9419-94fb35b644e8","dateUpdated":"2026-06-23T05:58:54.059Z"},"credits":[{"lang":"en","type":"remediation developer","value":"Andras Iklody"},{"lang":"en","type":"analyst","value":"Jeroen Pinoy"},{"lang":"en","type":"tool","value":"Claude (the international export version)"},{"lang":"en","type":"analyst","value":"Jakub Chyliński"}],"impacts":[{"capecId":"CAPEC-115","descriptions":[{"lang":"en","value":"CAPEC-115 Authentication Bypass"}]}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-22T16:09:12.774625Z","id":"CVE-2026-56422","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-22T16:09:17.731Z"}}]}}}