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CVE-2026-53595 is a critical improper authentication vulnerability in FreeScout affecting versions prior to 1.8.224. The flaw resides in the public user setup flow handled by the POST /user-setup/{hash}/{invite_sent_at} endpoint in OpenController@userSetupSave. The endpoint identifies the target account solely by the invite_hash value and then updates that account's email address and password before authenticating the requester as the modified user. No prior authentication, session, or cookie is required. After account activation, FreeScout clears invite_hash to an empty string. On MySQL and MariaDB, comparison behavior for VARCHAR values permits a trailing-space match, allowing an attacker to supply a space value that matches the cleared hash and causes selection of the lowest-ID activated account. The expiry validation for invite_sent_at is also flawed because decryption failure returns the original input unchanged, allowing a plaintext numeric timestamp-like value to satisfy the time-to-live check without possession of any secret. Together, these weaknesses enable unauthenticated takeover of an activated FreeScout account.
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Cross-references every affected SKU, including bundled OEM variants.
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