Vulnerabilities > CVE-2021-30477 - Unspecified vulnerability in Zulip Server

CVSS 4.3 - MEDIUM

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

LOW

Confidentiality impact

NONE

Integrity impact

LOW

Availability impact

NONE

network

low complexity

zulip

NVD

Published: 2021-04-15

Updated: 2022-07-12

Summary

An issue was discovered in Zulip Server before 3.4. A bug in the implementation of replies to messages sent by outgoing webhooks to private streams meant that an outgoing webhook bot could be used to send messages to private streams that the user was not intended to be able to send messages to.

Vulnerable Configurations

Part	Description	Count
Application	Zulip Zulip Zulip Server 1.1.5 Zulip Zulip Server 1.2.0 Zulip Zulip Server 1.2.1 Zulip Zulip Server 1.3.0 Zulip Zulip Server 1.3.1 Zulip Zulip Server 1.3.2 Zulip Zulip Server 1.3.3 Zulip Zulip Server 1.3.4 Zulip Zulip Server 1.3.5 Zulip Zulip Server 1.3.6 Zulip Zulip Server 1.3.7 Zulip Zulip Server 1.3.8 Zulip Zulip Server 1.3.9 Zulip Zulip Server 1.3.10 Zulip Zulip Server 1.3.11 Zulip Zulip Server 1.3.12 Zulip Zulip Server 1.3.13 Zulip Zulip Server 1.4.0 Zulip Zulip Server 1.4.1 Zulip Zulip Server 1.4.2 Zulip Zulip Server 1.4.3 Zulip Zulip Server 1.5.0 Zulip Zulip Server 1.5.1 Zulip Zulip Server 1.5.2 Zulip Zulip Server 1.6.0 Zulip Zulip Server 1.7.0 Zulip Zulip Server 1.7.1 Zulip Zulip Server 1.7.2 Zulip Zulip Server 1.8.0 Zulip Zulip Server 1.8.1 Zulip Zulip Server 1.9.0 Zulip Zulip Server 1.9.1 Zulip Zulip Server 1.9.2 Zulip Zulip Server 2.0.0 Zulip Zulip Server 2.0.1 Zulip Zulip Server 2.0.2 Zulip Zulip Server 2.0.3 Zulip Zulip Server 2.0.4 Zulip Zulip Server 2.0.5 Zulip Zulip Server 2.0.6 Zulip Zulip Server 2.0.7 Zulip Zulip Server 2.0.8 Zulip Zulip Server 2.1.0 Zulip Zulip Server 2.1.1 Zulip Zulip Server 2.1.2 Zulip Zulip Server 2.1.3 Zulip Zulip Server 2.1.4 Zulip Zulip Server 2.1.5 Zulip Zulip Server 2.1.6 Zulip Zulip Server 2.1.7 Zulip Zulip Server 3.0 Zulip Zulip Server 3.1	61

References

https://blog.zulip.com/2021/04/14/zulip-server-3-4/