CVE-2026-50281: Craft CMS's mass assignment via id in newAttributes during bulk duplicate overwrites existing elements

July 2, 2026

There is a mass-assignment flaw in the bulk-duplicate element action. Alice, holding only the permission to duplicate an entry she owns, submits an arbitrary id through the newAttributes request parameter. The duplication routine overrides its own id = null reset with that value and writes Alice’s attributes into Bob’s existing entry row.

References

github.com/advisories/GHSA-x5m4-g2cq-52pq
github.com/craftcms/cms/commit/8f6587c25050bbb6e080d59c71f6bb8932fc8600
github.com/craftcms/cms/security/advisories/GHSA-x5m4-g2cq-52pq
nvd.nist.gov/vuln/detail/CVE-2026-50281

Code Behaviors & Features

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