CVE-2021-32689

Nextcloud Talk not properly disassociating users from chats after account deletion

Description

Nextcloud Talk is a fully on-premises audio/video and chat communication service. In versions prior to 11.2.2, if a user was able to reuse an earlier used username, they could get access to any chat message sent to the previous user with this username. The issue was patched in versions 11.2.2 and 11.3.0. As a workaround, don't allow users to choose usernames themselves. This is the default behaviour of Nextcloud, but some user providers may allow doing so.

Category

8.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.26%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com
Affected: nextcloud security-advisories
Published at:
Updated at:

References

Link Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895c third party advisory
https://github.com/nextcloud/spreed/pull/5633 third party advisory patch
https://hackerone.com/reports/1200700 permissions required
https://github.com/nextcloud/spreed/releases/tag/v11.2.2 third party advisory release notes
https://github.com/nextcloud/spreed/releases/tag/v11.3.0 third party advisory release notes

Frequently Asked Questions

What is the severity of CVE-2021-32689?
CVE-2021-32689 has been scored as a high severity vulnerability.
How to fix CVE-2021-32689?
To fix CVE-2021-32689, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-32689 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-32689 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-32689?
CVE-2021-32689 affects nextcloud security-advisories.
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