Brute force protection allows to send more requests than intended

Description

Impact

When multiple requests are sent in parallel, all of them were executed even if the amount of faulty requests succeeded the limit by the time the response is sent to the client. This allowed to send as many requests the server could handle in parallel to bruteforce protected details instead of the configured limit (default 8).

Patches

It is recommended that the Nextcloud Server is upgraded to 25.0.7 or 26.0.2
It is recommended that the Nextcloud Enterprise Server is upgraded to 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7 or 26.0.2

Workarounds

• No workaround available

References

• HackerOne
• PullRequest

For more information

If you have any questions or comments about this advisory:

• Create a post in nextcloud/security-advisories
• Customers: Open a support ticket at portal.nextcloud.com