There is no way to be 100% sure, but:

• bitwarden and ente have open source clients that ecrypt all data locally in a way that the provider can’t restore data
• nextcloud isn’t optimal, while you can encypt data at rest, the provider might be able to spy on you
• With mail providers it is difficult, but mailbox.org has my (personal) trust by building their business model on data protection and open source

I can and do self host, but I’m not willing to provide these services for free. I don’t want to be responsible for other peoples passwords or family photos.

Thats where good, privacy-respecting services come into play. Instead of hosting for my neighbours, I would recommend mailbox.org, bitwarden, ente or a hosted nextcloud.

The blog post contains an interesting tineline. Apparently, the first fix was not sufficient. So if you have updated Vaultwaren before November 18, update it again.

Copy of the timeline:

• End of October 2024: ERNW assesses Vaultwarden for the customer.
• November 08, 2024: ERNW discloses the vulnerabilities to the Vaultwarden team.
• November 10, 2024: Fix and release of Vaultwarden v1.32.4.
• November 11, 2024: ERNW retests the software and identifies that the fix is not sufficient.
• November 11, 2024: Public merge with fix and request for feedback by the Vaultwarden team.
• November 12, 2024: ERNW acknowledges that the fix is complete.
• November 18, 2024: Release of Vaultwarden v1.32.5.