CVE-2021-32689 is a vulnerability in Nextcloud Talk
Published on July 12, 2021
Nextcloud Talk not properly disassociating users from chats after account deletion
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.
Vulnerability Analysis
CVE-2021-32689 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Types
Incorrect Ownership Assignment
The software assigns an owner to a resource, but the owner is outside of the intended control sphere. This may allow the resource to be manipulated by actors outside of the intended control sphere.
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2021-32689 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2021-32689
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Affected Versions
nextcloud security-advisories Version < 11.2.2 is affected by CVE-2021-32689Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.