CVE-2021-32689

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.

• CWE-200
• CWE-708

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895cThird Party Advisory
• https://github.com/nextcloud/spreed/pull/5633Patch, Third Party Advisory
• https://github.com/nextcloud/spreed/releases/tag/v11.2.2Release Notes, Third Party Advisory
• https://github.com/nextcloud/spreed/releases/tag/v11.3.0Release Notes, Third Party Advisory
• https://hackerone.com/reports/1200700Permissions Required
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895cThird Party Advisory
• https://github.com/nextcloud/spreed/pull/5633Patch, Third Party Advisory
• https://github.com/nextcloud/spreed/releases/tag/v11.2.2Release Notes, Third Party Advisory
• https://github.com/nextcloud/spreed/releases/tag/v11.3.0Release Notes, Third Party Advisory
• https://hackerone.com/reports/1200700Permissions Required

Published

Jul 12, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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