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CVE-2026-55617 is an insufficient session expiration flaw in Hydro's session recreation logic. According to the provided advisory, when Hydro recreates a session during logout or session renewal, the previously valid server-side session associated with the old sid cookie is not properly invalidated before a new session is created. As a result, an old sid cookie that should no longer be usable can remain valid and continue to authenticate requests. The issue is effectively caused by failure to delete the old server-side session token during session recreation, allowing stale session identifiers to be replayed after logout or renewal.
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