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

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zulip Server
Web applications / Other software

Vendor: Zulip

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Zulip Server: 3.0 - 3.3

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External links
http://blog.zulip.com/2021/04/14/zulip-server-3-4/

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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.