CVE-2021-32689
mediumpriority · track · 26EPSS 0.010 · 63 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4–8.1
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (15)
External citations — patches, advisories, analysis.
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895ccnnvd
- https://github.com/nextcloud/spreed/pull/5633cnnvd
- https://github.com/nextcloud/spreed/releases/tag/v11.2.2cnnvd
- https://github.com/nextcloud/spreed/releases/tag/v11.3.0cnnvd
- https://hackerone.com/reports/1200700cnnvd
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895cenisa_euvd
- https://github.com/nextcloud/spreed/pull/5633enisa_euvd
- https://github.com/nextcloud/spreed/releases/tag/v11.2.2enisa_euvd
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