CVE-2021-30477

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    CVE-2021-30477

    Published: 15 Apr 2021Last Modified: 7 Aug 2026

    Summary:

    Details: 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.

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

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -974b95b0956e6be5ef43683fbfac951d6460c802

    Affected versions

    3.3

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-30477 | CVE-DB