Improper Authorization in Zulip Server - CVE-2023-32678
Published: August 25, 2023
Vulnerability identifier: #VU80017
CSH Severity: Medium
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-32678
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to gain access to restricted functionality.
The vulnerability exists due to improper authorization. Authenticated users who used to be subscribed to a private stream, and have since been removed from it, retained the ability to edit messages/topics and delete messages that they used to have access to, if other relevant organization permissions allowed these actions. For example, a user may have still been able to edit or delete their old messages they had posted in such a private stream.
Affected software
Zulip Server
How to mitigate CVE-2023-32678
Install updates from vendor's website.
Zulip Server - update to 7.3