What’s Vulnerable › Vulnerabilities

CVE-2021-32689: Nextcloud Talk not properly disassociating users from chats after account deletion

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-12 · updated 2026-06-17
• Weakness: CWE-200

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.

Affected products

• Nextcloud Talk: before 11.2.2 — fixed in 11.2.2

How to fix

Upgrade to a fixed version: Nextcloud Talk 11.2.2. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895c
• https://github.com/nextcloud/spreed/pull/5633
• https://github.com/nextcloud/spreed/releases/tag/v11.2.2
• https://github.com/nextcloud/spreed/releases/tag/v11.3.0
• https://hackerone.com/reports/1200700
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895c
• https://github.com/nextcloud/spreed/pull/5633
• https://github.com/nextcloud/spreed/releases/tag/v11.2.2
• https://github.com/nextcloud/spreed/releases/tag/v11.3.0
• https://hackerone.com/reports/1200700

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