Impact

If the conversation is password protected and an attacker got the link/conversation token, they can brute force the password because there is no brute force protection.

Patches

It is recommended that the Nextcloud Talk is upgraded to 12.2.7, 13.0.7 or 14.0.3

Workarounds

No workaround available apart from not having password protected conversations.

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 support.nextcloud.com