CVE-2021-30477

2021-04-1500:15:13

Google

osv.dev

zulip server

unauthorized messages

private streams

outgoing webhooks

AI Score

6.7

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/