CVE-2021-30477

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CVSS 3.1

4.3 medium

EPSS

<1%p49

Published

Apr 15, 2021 (Apr 15, 2021)

Modified

Jun 17, 2026

Description

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.

Vendors: zulip
Products: zulip server
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.7%)

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