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Vulnerability · Published Jul 12, 2021 · Assigned by GitHub_M

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

High 8.1

In plain English

A high-severity information exposure in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 63% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)1.0%top 37.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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 (as reported)

VendorProductVersions
nextcloud security-advisories < 11.2.2

Weakness: CWE-708, CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References