Record whether it is on an accessible exterior surface or coming from a fixed seam. Do not seal the area with adhesive or drill a drainage hole.
What the observation tells you
Condensation, a spill travelling from above and an internal water issue can look similar at the point of collection. The cabinet's hidden construction cannot be determined from the seam alone. Water near controls or wiring needs particular caution.
A useful next step
Wipe only safe accessible surfaces and note recurrence and surrounding conditions. Seek model-specific assessment if the source is unexplained, keeping food protected if cooling is affected.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.