CVE-2021-30477

2021-04-1423:45:14

mitre

www.cve.org

zulip server

outgoing webhook

private streams

security issue

AI Score

4.8

Confidence

High

EPSS

0.001

Percentile

22.7%

JSON

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

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