GHSA-3cjh-p6pw-jhv9

Use of `Pow.Store.Backend.MnesiaCache` is susceptible to session hijacking as expired keys are not being invalidated correctly on startup. A cache key may become expired when all `Pow.Store.Backend.MnesiaCache` instances have been shut down for a period that is longer than the keys' remaining TTL and the expired key won't be invalidated on startups.

### Workarounds

The expired keys, including all expired sessions, can be manually invalidated by running:

```elixir :mnesia.sync_transaction(fn -> Enum.each(:mnesia.dirty_select(Pow.Store.Backend.MnesiaCache, [{{Pow.Store.Backend.MnesiaCache, :_, :_}, [], [:"$_"]}]), fn {_, key, {_value, expire}} -> ttl = expire - :os.system_time(:millisecond) if ttl < 0, do: :mnesia.delete({Pow.Store.Backend.MnesiaCache, key}) end) end) ```

### References https://github.com/pow-auth/pow/commit/15dc525be03c466daa5d2119ca7acdec7b24ed17 https://github.com/pow-auth/pow/issues/713 https://github.com/pow-auth/pow/pull/714