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CVE-2021-30477

Good to know:

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Date: April 14, 2021

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.

Language: C

Severity Score

Related Resources (3)

https://nvd.nist.gov/vuln/detail/CVE-2021-30477
https://blog.zulip.com/2021/04/14/zulip-server-3-4/
https://www.mend.io/vulnerability-database/CVE-2021-30477

Severity Score

Weakness Type (CWE)

Insufficient Information

NVD-CWE-noinfo

Incorrect Permission Assignment for Critical Resource

CWE-732

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): SINGLE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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