#VU52314 Improper access control

Published: 2021-04-19

Vulnerability identifier: #VU52314

Vulnerability risk: Low

CVSSv3.1: 3.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-30487


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zulip Server
Web applications / Other software

Vendor: Zulip


The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the topic moving API. A remote administrator can move messages to streams in other organizations hosted by the same Zulip installation.

Install updates from vendor's website.

Vulnerable software versions

Zulip Server: 3.0, 3.1, 3.2, 3.3


External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Latest bulletins with this vulnerability