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CVE-2026-53637 is an integrity flaw in Sylius affecting the Cart FormComponent's handling of stale cart state after checkout completion. An authenticated user who retains and submits an outdated cart page can interact with an order that has already been completed, allowing post-checkout modification or deletion of data that should no longer be mutable. The issue stems from insufficient validation of order state during cart form processing, enabling operations against an already-finalized order object.
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